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Copper laser powder bed fusion (Cu-LPBF) is known as a challenging manufacturing process. Since copper is an excellent thermal and electrical conductor, low to medium laser power is insufficient to provide good wettability and fusion between either adjacent tracks or deposited layers due to heat dissipation and high reflectivity. Particle surface modification has therefore been proposed to improve optical absorptivity. A simple method to enhance optical absorptivity is to create a thin oxide film by heating copper powder in an air furnace. The first phase of the current work emphasizes that this technique is detrimental to the part quality if a medium laser power range is used. The second phase presents a novel technique of two stages of in-situ copper oxide reduction during LPBF. It provides an innovative approach for combining laser cleaning and melting in LPBF. The newly suggested technique uses recycled and surface oxidized Cu powders to develop a simple and chemical-free method to recover the contaminated powder. A significant improvement is achieved by applying laser surface cleaning to the powder and solidified layers. The oxygen content is reduced by 70% in the LPBF samples compared to the initial state of the oxidized powder. [ABSTRACT FROM AUTHOR]

The prime goal of this novel work is to investigate the efficacy of spinel zinc ferrite as a thermoelectric material and its performance enhancement for high temperature applications. Zn 1-x Ni x Fe 2 O 4 (0 ≤ x ≤ 0.2) were prepared by sol-gel method and their structural, morphological, and thermoelectric behaviours were examined as functions of composition and temperature. Among the studied compositions, Zn 0.8 Ni 0.2 Fe 2 O 4 exhibits the highest electrical conductivity (σ) of 49.83 S/m, the largest power factor of 6.66 μW/mK2, and the lowest thermal conductivity (κ) of 0.36 W/mK at 947 K, thus extending to an overall enhancement in the thermoelectric figure of merit (zT). Conduction through electron hopping is proven to be the main driving force for the enhancement in electrical and thus thermoelectric properties. Results reveal that thermoelectric properties of ZnFe 2 O 4 can potentially be enhanced by the doping Ni at Zn site and opens up an exciting opportunity for the utilization of this spinel ferrite as a novel thermoelectric material for applications involving elevated temperatures. [Display omitted] • Thermoelectric figure of merit of ZnFe 2 O 4 was considerably enhanced by doping Ni. • Electron hopping is found to be one of the major contributors for the enhancement of electrical conductivity. • The dopant is also effective in reducing the thermal conductivity of ZnFe 2 O 4 at higher temperatures. • The results indicate that the studied material is suitable for high temperature (>700K) thermoelectric applications. [ABSTRACT FROM AUTHOR]

Peat is an unrenewable resource. Compost can partially replace peat in the growing seedling substrates due to its high electrical conductivity (EC), bulk density (BD), and pH. This study aimed to assess the potential of substituting peat for seedling substrate with compost made from a mixture of agricultural and agro-industrial wastes. Four compost piles (C1–C4) were constructed as follows: C1: a 1:1:1.5 weight ratio mixture of filter mud, mushroom waste, and date-palm fronds, while C2–C4: a 0.5:1 weight ratio mixture of either bagasse, cutting grassland, or date-palm fronds and cattle dung. After four months of decomposition, the compost's physical, chemical, and biological properties were estimated in comparison to commercial compost (CC), peatmoss (PM), and their ideal ranges (IR) for seed germination and seedling growth. Composts differed significantly in their physical and chemical properties. Some composts revealed property values within the IR. In comparison to PM, Composts have a lower C/N ratio and organic matter, along with higher BD, EC, and pH. Cattle manure enhanced organic matter and carbon, total nitrogen and potassium, and ammonium levels, and reduced ash levels in C2–C4 compared to filter mud in C1. In winter 2018 and 2019, C1–C4 substrates were compared with CC and PM substrates to determine their suitability for producing crisp lettuce 'Big Bell' seedlings under plastic-house conditions. Substrates had significant effects on lettuce seedling traits. Shoots of C2–C4 substrate seedlings grew more rapidly than those of other substrate seedlings due to the increased length and diameter of their stem and leaf area. [ABSTRACT FROM AUTHOR]

This study investigates the effect of (Co + Al) co−doping on the physical properties of the ZnO nanoparticles, synthesized via the simple co−precipitation method. X−ray diffraction (XRD) analysis revealed a hexagonal structure for all samples, with a formation of Al 2 O 3 phase in both Zn 0.98 Co 0.01 Al 0.01 O and Zn 0.94 Co 0.01 Al 0.05 O nanoparticles. The crystallite size increased from 26.5 nm for ZnO to 16.6 nm for Zn 0.94 Co 0.01 Al 0.05 O nanoparticles. Scanning electron microscopy (SEM) technique showed a notable alteration in the morphology of ZnO upon the incorporation of Al. A transition from spherical nanoparticles in ZnO and Co doped ZnO to irregular, dendritic-like structures in (Co + Al) co−doped nanoparticles is observed. Transmission electron microscopy (TEM) substantiated the presence of the Al 2 O 3 phase in the co−doped samples. Raman and FTIR spectroscopy confirmed the incorporation of Co and Al into the ZnO lattice through the presence of Co–O–Co and Al–O bonds. Optical characterization indicated a decrease in the band gap energy from 3.18 eV in ZnO to 2.84 eV in Zn 0.94 Co 0.01 Al 0.05 O nanoparticles. Electrical conductivity measurements revealed an increase from 1.2 × 10−4 Ω−1 cm−1 to 1.8 × 10−3 Ω−1 cm−1 as the Al content increased from 0 % to 5 % at the frequency of 103 Hz and the temperature of 423K. Likewise, dielectric constant raised from 775 in ZnO to 5455 in Zn 0.94 Co 0.01 Al 0.05 O nanoparticles at the temperature 423K. These results highlight the potential of (Co + Al) co−doped ZnO nanoparticles for advanced optoelectronic applications. [ABSTRACT FROM AUTHOR]

With the development of nanotechnology, laser matter interaction has become intriguing for many applications, including the manufacturing of flexible electronics to improve interface behaviors. Employing high laser repetition rate nanojoining transfer patterning, this study ensures the robust and consistent stability of electrical properties of MWCNTs. This procedure meticulously eliminates contaminants from the interface between flexible PET substrates and carbon nanotube‐containing epoxy, significantly influencing the degree of alteration in composite material and interface behaviors. By increasing the laser repetition rate from the original sample to the sample irradiated by a laser with a repetition rate of 80 kHz, the defect concentration in carbon nanotubes decreases from 0.448 × 106/nm2 to 0.39376 × 106/nm2, respectively. The relationship between defect concentration and electrical conductivity in semiconductor carbon nanotubes under laser irradiation is multifaceted and context‐dependent. Optimizing the laser repetition rate is crucial in defining the kind and density of semiconductor carbon nanotubes. This study found an electrical conductivity of 3.6799 × 10−4 S/m at a laser repetition rate of 80 kHz. Laser ablation nanojoining with a high laser repetition rate is poised to become a key recycling method for plastic materials in future industries. When MWCNTs are used in processing new materials, this method not only enhances the electrical and mechanical properties of recycled plastics but also creates high‐performance composites with added value. Additionally, the quick nature of this process helps minimize toxicity in material processing by reducing exposure time and the need for harmful chemicals. These composites exhibit superior properties suitable for advanced applications such as flexible electronics, sensors, and nanocomposite materials, contributing to both sustainability and economic value in various industrial sectors. [ABSTRACT FROM AUTHOR]

The study aimed to evaluate the spatial distribution of soil pH, electrical conductivity (EC), and particle size distribution within a seven-hectare field in Los Baños Laguna, Philippines using the ordinary kriging method and to utilize the interpolated maps to delineate management zones. Fifty soil samples were collected from the surface layer at a depth of 0–20 cm using a random sampling technique. On the basis of the obtained results, it was found that the area has an acidic pH, medium-textured soil with low soluble salt content. Geostatistical analysis revealed that soil EC and clay content exhibited strong spatial dependence, while soil pH and silt were observed to have a moderate spatial dependence. In contrast, sand exhibited weak spatial dependence. The spherical model was identified as the optimal fit for soil pH, clay content, silt content, and sand content, while the exponential model was deemed most suitable for EC. Three distinct management zones (MZs) were delineated based on the spatial variability of the selected properties. MZ1, the largest zone covering 82.10% of the area, is characterized by a weakly acidic, clay loam soil while MZ2, comprising 15.11% of the area, has a weakly acidic loam soil. MZ3, the smallest zone occupying 2.79% of the area, has a highly acidic loam soil and may require frequent as well as intensive lime applications. These findings highlight the varied spatial dependency and distribution of soil characteristics even in a relatively small area and the usefulness of the interpolated maps as a valuable tool to identify specific management zones. [ABSTRACT FROM AUTHOR]

The study presents the ideal distribution of graphene nanoplatelets (GNP) within the thermoplastic starch (TPS) matrix significantly elevated the thermal and electrical conductivities, as well as the electrochemical efficiency of the biocomposites. Additionally, the incorporation of GNP resulted in an increased thermal stability for the TPS, as indicated by the elevated temperatures required for maximum degradation. The biocomposites exhibited a self‐aligned layered structure, creating conductive pathways and enhancing electron conduction. An electrical conductivity increased as the concentration of GNP increased, with the highest conductivity observed on the top and bottom surface with the value of 4.23 × 10−7 S/m and 3.92 × 10−6 S/m when 12 wt% of GNP was added. The presence of hydroxyl groups in TPS facilitated the formation of hydrogen bonds with GNP, preventing GNP from stacking and forming a more uniform conductive network within the film. The addition of 15 wt% GNP also improved the capacitive performance of the TPS matrix, as evidenced by higher current responses and larger quasi‐rectangular areas in the cyclic voltammetry curves compared to neat TPS. The Nyquist plots which are illustrated impedance data showed that the TPS film with 12 wt% GNP exhibits the smallest semicircle, indicating the highest conductivity which is suggested that GNP improves charge transfer compared to pure TPS. Highlights: Optimal dispersion of GNP enhanced the biocomposite's properties.The electrical conductivity increases with the GNP content until 12 wt%.TPS/GNP self‐aligned layered improved conduction and capacitive behavior.GNP improved thermal stability by restricting polymer chain movement.Electrochemical impedance shows improved properties of TPS/GNP. [ABSTRACT FROM AUTHOR]

Understanding charge transport properties of large‐area single‐layer 2D materials is crucial for the future development of novel optoelectronic devices. In this work, the synthesis and electrical characterization of large‐area single‐layers of Cu3BHT 2D conjugated coordination polymers are reported. The Cu3BHT are synthesized on the water surface by the Langmuir‐Blodgett method and then transferred to SiO2/Si substrates with pre‐patterned electrical contacts. Electrical measurements revealed ohmic responses across areas up to ≈1 cm2, with a mean resistance of approximately 53 ± 3 kΩ at a probe separation of 50 µm. Cooling and heating cycles show hysteresis in the electrical response, suggesting different current pathways are formed as the samples underwent structural‐chemical changes during temperature sweeps. This hysteresis vanished after several cycles and the conductivity shows a stable exponential behavior as a function of temperature, suggesting that a temperature‐dependent tunneling process is governing the conduction mechanism in the analyzed polycrystalline single‐layer Cu3BHT samples. These results, together with density functional theory calculations and valence band X‐ray photoelectron spectroscopy data suggest that the single‐layer samples exhibit a semiconducting rather than a metallic behavior. [ABSTRACT FROM AUTHOR]

There is great interest in developing advanced electrical conductors with higher conductivity, lighter weight, and higher mechanical strength than copper (Cu). One promising candidate is copper‐graphene (Cu‐Gr) composite, which is hypothesized to have a higher electrical conductivity than Cu. In this work, it is shown that this is not true, supported by state‐of‐the‐art first‐principles calculations of electron transport. Particularly, contrary to the belief that graphene in the composite is more conductive than pristine Cu, it is less conductive due to increased scattering despite increased carrier concentration. On the other hand, it is found that compressive strain along the (111) plane increases the conductivity, which is confirmed experimentally, while tensile strain has little effect. The work offers new insights into understanding and developing advanced conductors. [ABSTRACT FROM AUTHOR]

The top‐seeded solution growth for rutile GeO2 single crystals using alkali carbonates or fluorides as flux is applied. Structural data of obtained single crystals confirm the rutile phase with a = b = 4.3966 Å and c = 2.8612 Å. The crystals with diameter of 5–15 mm are either undoped or intentionally doped with Sb5+, Sn4+, Al3+, Ga3+, and F− ions. It is found that Sb5+ is a very efficient n‐type donor enabling free electron concentration even above 1020 cm−3; thus, Sb‐doped GeO2 is a potential substrate for vertical power devices. In contrast, crystals doped with Al and Ga do not show p‐type conductivity suggested by the theory. The onset of the absorption occurs at 5.0 and 5.5 eV perpendicular and parallel to the c‐axis, respectively. Rutile GeO2 shows a very intense photoluminescence peaking at 420 nm (blue) and 520 nm (green). Raman spectra show narrow lines, in particular at high phonon energy (B1g, 170 cm−1). Prepared wafers show FWHM values of rocking curves below 30 arcsec and polishing is achieved down to RMS roughness of 0.15 nm. Transmission electron microscopy images do not show point or extended structural defects with uniform Sb distribution. [ABSTRACT FROM AUTHOR]

Several strategies have been adopted to enhance the electrochemical features of metal-organic framework structures for water splitting, however, a suitable conditions can effectively boost the electrocatalytic activity. Herein, molybdenum-based zeolite imidazolate frameworks (Mo 2g ZIF-67 and Mo 4g ZIF-67) have been synthesized by solvothermal process and electrocatalytic activity was examined at various elevating temperatures of 1 M KOH electrolyte. Mo 4g ZIF-67 nanorods showed the overpotential (η 10) of 358 mV at 20 °C, which was improved to 221 mV at 80 °C for the oxygen evolution reaction. Mo 4g ZIF-67 nanorods exhibited the Tafel slope of 77 mV dec−1 at 80 °C and followed the Volmer-Heyrovsky mechanism. LSV curves reveal that Mo 4g ZIF-67 nanorods showed a greater current density and a good turnover frequency (TOF) of 221.0 ms−1 at the fixed V RHE of 0.7 V. Similarly, Mo 4g ZIF-67 nanorods revealed the η 10 of 181 and 93 mV at 20 and 80 °C, respectively for the HER process. Mo 4g ZIF-67 nanorods displayed a Tafel slope of 95 mV dec−1 and TOF of 213.50 ms−1. The enhanced electrocatalytic activity may be due to rising temperatures, enhanced electrical conductivity at rising temperatures, well defined nanorods shape and greater ECSA, which provided the active sites and facile the flow of charge carriers for oxygen and hydrogen evolution reaction. The electrocatalyst, Mo 4g ZIF-67 nanorods exhibited a uniform current density during stability tests for 30 h at 20 °C, which was increased at 80 °C. Temperature elevation remarkably enhanced the HER and OER characteristics of the Mo 4g ZIF-67 nanorods and suggested an effective electrocatalyst for water splitting. • Mo 4 gZIF-67 nanorods have been synthesized by solvothermal treatment. • Mo 4g ZIF-67 nanorods showed the η 10 of 221 mV at 80 °C for the OER process. • Mo 4g ZIF-67 nanorods exhibited a Tafel slope of 77 mV dec−1 at 80 °C for OER process. • Mo 4g ZIF-67 nanorods exposed the η 10 of 93 mV at 80 °C for the HER process. • Mo 4g ZIF-67 nanorods displayed a TOF of 213.50 ms−1. [ABSTRACT FROM AUTHOR]

In this study, the objective was to improve the performance of bismuth vanadium oxide Bi 4 V 2 O 11 by synthesizing double substituted compounds using copper ions Cu2+ and tantalum ions Ta5+. Bi 4 V 2-x Cu x/2 Ta x/2 O 11-3x/4 (0.1 ≤ x ≤ 0.5) polycrystalline samples of were prepared via the solid-state route. XRD patterns measured at room temperature revealed the stabilization of the monoclinic α-Bi 4 V 2 O 11 type structure for x = 0.1 and the tetragonal γ or γ' -Bi 4 V 2 O 11 for x > 0.2. This result has been confirmed by thermogravimetric analysis (DTA), FT-IR spectroscopy and Raman scattering measurements. The influence of the composition on the microstructure and grain size of the prepared samples was explored through dilatometric study, density measurements, and scanning electron microscopy (SEM). Thermal Raman spectra evolution was also investigated. The temperature-dependent Raman spectroscopy analysis of the compound α-BiCuTaVOx (x = 0.1) demonstrated variations in the position, intensity, and width of the Raman mode around 850 cm−1, indicating temperature-assisted structural modifications. One defining feature of the tetragonal-dominated phase of the BiMeVOx systems is the increasing merging of the weak band at 930 cm−1 with the dominating band at 850 cm−1. This behavior was also observed for our samples. The V–O bond lengths were calculated using an empirical relation based on the diatomic approximation. Electrochemical impedance spectroscopy (EIS) was used to investigate the changes in electrical conductivity with the substitution rate across the temperature range of 300–720 °C. The sample with x = 0.3 exhibited the highest electrical conductivity at both high and low temperatures. However, the optimal substitution rate to achieve the best conductivity in this series of copper and tantalum-substituted BiCuTaVOx was found to be x = 0.3 (σ = 4 × 10−3 S cm−1 at 600 °C). [ABSTRACT FROM AUTHOR]

This study uses slag (SL), fly ash (FA), and carbon fiber (CF) as raw materials to fabricate a conductive geopolymer, exploring the impact of CF content on its workability and mechanical performance. The conductivity and pressure sensitivity performance of the geopolymer are tested using an embedded four‐electrode method. The findings indicate that the incorporation of CF reduces the fluidity of the geopolymer and shortens its setting time. With the increase of CF content, the compressive strength increases first and then decreases, while the flexural strength increases gradually when the CF content is 0.2 v%, the percolation threshold is reached, and the resistivity is 268 Ω·cm. The geopolymer exhibits good pressure sensitivity performance under both monotonic and cyclic loading. With a stress amplitude of 15 MPa and a loading rate of 1 kN/s, the specimen's resistance change rate can reach −38.4%. The pressure sensitivity performance is optimal, with good repeatability and stability. [ABSTRACT FROM AUTHOR]

As an electrochemical device that converts the chemical energy of fuel directly into electrical energy, the fuel cell is a new alternative technology that uses fuel from renewable sources and generates power for sustainable development and energy security. Among various types of fuel cells, the direct carbon fuel cell (DCFC) has higher efficiency because carbon fuel has higher energy density than liquid or gas fuel. However, the current development of DCFCs is still limited by the sluggish activity of the cathode reaction. In this study, a new composite cathode made of Gd0.2Ce0.8O1.9 (GDC) and SrFe1−xTixO3–δ (SFT) is developed for a Nicotiana tabacum-derived carbon fuel-based DCFC. The structural, optical, and electrochemical properties of the materials are systematically evaluated. X-ray diffraction analysis results show a cubic structure of GDC and cubic perovskite phase of SFT in the sample, with crystallite sizes of 37 and 15 nm, respectively. Ultraviolet–visible spectroscopy reveals an indirect band gap which exhibits a red shift. Fourier transform infrared spectroscopy confirms the presence of Ce–O, Sr–Ti–O, and Fe–O functional groups in all the samples. Scanning electron microscopy analysis shows the morphology and particle size of the materials. The sample Gd0.2Ce0.8O2-δ–SrFe0.96Ti0.04O1.9 exhibits the highest electrical conductivity of 4.96 S cm−1 in an oxygen atmosphere at 600 °C and a higher power density of 40 mW cm−2 at 600 °C compared to other samples using Nicotiana tabacum carbon fuel. These findings indicate that the developed composite cathode is an efficient cathode for low-temperature DCFCs. [ABSTRACT FROM AUTHOR]

In this work, we study the effect of Ni-doping on the structural and impedance spectroscopy properties of the polycrystalline YCrO 3 ceramic sample. The structural analysis shows all the samples crystallize in an orthorhombic structure with the Pnma space group. The depressed and asymmetric semicircle of complex impedance spectra indicates that the relaxation of charge carriers is of non-Debye type, where the thermally activated charge carriers control it. The temperature dependence of relaxation time and electrical conductivity exhibit an anomaly in the vicinity of diffuse-like relaxor transition temperature (T C ∼ 460 K). The analysis of conductivity data shows hopping-type charge conduction. The analysis further indicates that while the dc conductivity increases continuously, the activation energy shows a non-monotonous variation with Ni concentration. [ABSTRACT FROM AUTHOR]

As is well known, Paul Drude put forward the very first quantitative theory of electrical conduction in metals in 1900. He could successfully account for the Wiedemann–Franz law which states that the ratio of thermal to electrical conductivity divided by temperature is a constant called the Lorenz number. As it turns out, in Drude's derivation there is a lucky cancellation of two errors. Drude's underestimatation (by an order of 100) of the value of square of the average electron velocity compensated for his overestimatation of the electronic heat capacity (by the same order of 100). This compensation or cancellation of two errors lead to a value of the Lorenz number very close to its experimental value; which is well known. There is another error of a factor of two which Drude made when he calculated two different relaxation times for heat conductivity and electrical conductivity; in this article we highlight how and why this error occurred in Drude's derivation and how it was removed 5 years later (in 1905) by Hendrik Lorentz when he used the Boltzmann equation and a single relaxation time. This article is of pedagogical value and may be useful to undergraduate/graduate students learning solid state physics. [ABSTRACT FROM AUTHOR]

The goal of this research is to create a perovskite ceramic with electrical and dielectric properties appropriate for energy storage, medical uses, and electronic devices. A bismuth ferric titanate, Bi0.7Ba0.3(FeTi)0.5O3, doped with barium and crystalline, was effectively synthesized at the A-site via sol–gel synthesis. A rhombohedral structure emerged in the R3́C space group, which was confirmed by room-temperature X-ray studies. An average grain size of 263 nm and a homogeneous grain distribution and chemical composition were confirmed by the results of scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). The study established a clear relationship between temperature, frequency, and the electrical properties of the material. Impedance spectroscopy and electrical modulus measurements, performed in the frequency range of 1 kHz to 1 MHz and at temperatures ranging from 200 K to 360 K, demonstrated a non-Debye type of relaxation. Furthermore, once the material was produced at various temperatures, its frequency-dependent electrical conductivity was examined using Jonscher's law. The results demonstrate that barium doping significantly improves the electrical conductivity and dielectric properties compared to pure BiFeTiO₃. Over the complete temperature range, consistent conduction and relaxation mechanisms were discovered. These findings suggest that the chemical may find widespread applicability across a broad temperature range, including electrical fields and capacitors. Highlights: Successful Synthesis: A perovskite ceramic, Bi0.7Ba0.3(FeTi)0.5O3, was synthesized using the sol–gel method, doped with barium at the A-site. Structural Properties: X-ray diffraction confirmed a rhombohedral structure in the R3́C space group, with an average grain size of 263 nm, as analyzed through SEM and EDX techniques. Enhanced Electrical and Dielectric Properties: Barium doping significantly improved the electrical conductivity and dielectric properties of the material compared to undoped BiFeTiO₃, making it suitable for energy storage and electronic applications. Non-Debye Relaxation Behavior: Impedance spectroscopy and electrical modulus analysis in the frequency range of 1 kHz to 1 MHz and temperature range of 200–360 K revealed non-Debye type relaxation. Wide Applicability: The study identified stable conduction and relaxation mechanisms over a broad temperature range, suggesting potential use in capacitors and electrical fields across various temperature conditions. [ABSTRACT FROM AUTHOR]

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This study aims to optimize the Pr 2 NiO 4+δ electrode material for increased phase stability at IT-SOFC operating temperatures while maintaining high electrochemical activity. This is achieved by double doping at both Pr and Ni sites. The series of new Pr 1.6 Ca 0.4 Ni 1–y Cu y O 4+δ complex oxides are synthesized by the pyrolysis of the glycerol-nitrate compositions. The resulting materials are extensively studied by room and high-temperature XRD, XPS, TGA, SEM, dilatometry, DC-four probe method, and impedance spectroscopy. The study has registered the formation of the homogeneous complex oxide phases with an orthorhombic structure (Bmab sp. gr.) throughout the dopant concentration range of y = 0.0–0.4. For the Cu-rich samples, an increased Pr4+ content and the presence of Ni2+ and Cu+1 are observed, resulting in a gradual decrease of both the electroconductivity and the absolute oxygen content (δ ∼ 0 at y ≥ 0.2). Nevertheless, the Pr 1.6 Ca 0.4 Ni 1–y Cu y O 4+δ series materials exhibit excellent phase stability and chemical and thermomechanical compatibility with CeO 2 - and BaCe(Zr)O 3 -based electrolytes. Moreover, Cu-doping enhances the electrochemical activity of the electrodes. The polarization resistance of the Pr 1.6 Ca 0.4 Ni 0.8 Cu 0.2 O 4+δ electrode, is in the range of 0.19–0.27 Ω cm2 (at 700 °C) depending on the electrolyte substrate and shows a low dependence on the water content, demonstrating the applicability of the electrode in fuel cells and electrolysis cells based on both oxygen-ion and proton-conducting electrolytes. [Display omitted] • New Pr 1.6 Ca 0.4 Ni 1–y Cu y O 4+δ (y ≤ 0.4) oxides are obtained by glycerol-nitrate pyrolysis. • These oxides exhibit increased phase stability and compatibility with electrolytes. • Double doping maintains satisfactory conductivity level. • Moderate Cu doping enhances electrochemical activity of the electrodes. • Pr 1.6 Ca 0.4 Ni 0.8 Cu 0.2 O 4+δ is a promising candidate for use in IT SOCs. [ABSTRACT FROM AUTHOR]

Pr 2 NiO 4+δ -based materials are considered as promising air electrodes for proton ceramic electrochemical cells due to their wide range of attractive properties. In the present work, the basic functional properties of Pr 2 NiO 4+δ are optimized by substituting Pr-cations with isovalent La- and Nd-ions. The synthesized samples are characterized by X-ray diffraction analysis, thermogravimetry in oxidizing and reducing environments, dilatometry, and four-probe conductivity measurements. As a result, the relationships between crystal and defect structures on the one hand and their electrotransport and thermomechanical properties on the other hand are revealed. The PrLaNiO 4+δ , Pr 1.5 La 0.5 NiO 4+δ , and PrLa 0.5 Nd 0.5 NiO 4+δ compositions are stabilized by the large lanthanum cation and do not show the phase transition (from Fmmm to I 4/ mmm space group) typical of the other studied compounds. The conductivity values of the studied materials remain practically unchanged for most of the compositions, but the La-doping reduces the activation energies of hole transfer. Based on the obtained data, two optimal compositions (Pr 1.5 La 0.5 NiO 4+δ and PrLa 0.5 Nd 0.5 NiO 4+δ) can be identified for their further application in electrochemical cells. [Display omitted] • (Pr x La y Nd z)PrNiO 4+δ (x + y + z = 1) are synthesized by citrate-nitrate method. • Doped materials obtained have orthorhombic structure of Pr 2 NiO 4+δ. • Doping with La or Nd results in a decrease of oxygen content of Pr 2 NiO 4+δ. • Nd- and La-doping have the opposite effect on thermal expansion of Pr 2 NiO 4+δ. • Doping with lanthanum reduces the activation energy of hole mobility. [ABSTRACT FROM AUTHOR]

The electrical conductivity and volt–ampere characteristics (VAC) of the p-CuTlS2 single crystal with specific resistance ρ = 4 0 Ω ⋅ cm and irradiated by γ -quantum were studied in the range of 100–300 K temperature and 10–104 V/cm. It was determined that the cause of the conduction disorder observed in the CuTlS2 single crystal at low electric fields and high radiation doses is the formation of defect clusters dominated by cation vacancies. A sharp increase in current at high electric fields and temperatures occurs as a result of thermo-field ionization of the acceptor level with activation energy Δ E a = 0. 0 8 eV and the ionization voltage decreases with increasing radiation dose. Based on the determination of the parameters (λ , r m , n 0 , ε) that determine the mechanism of current flow, the dependence of the shape of the potential hole on the radiation dose was determined. [ABSTRACT FROM AUTHOR]

Two monomeric octahedral complexes {[Ni(N(CN)2)2(bpy)2]2·H2O (1) and [Mn(N(CN)2)2(bpy)2] (2) where bpy = 2,2′‐bipyridine} were synthesized and characterized by single crystal X‐ray diffraction, elemental analysis, UV–visible, and IR spectra. The geometry optimization through DFT measurements predicts that both the complexes have similar monomeric structures with hexa‐coordinated metal centers having a couple of bpy and mononegative dca anions and thus satisfying the octahedral geometry. Moreover, it is found that the HOMO–LUMO energy gaps are ΔE = 4.981 and 5.563 eV for complexes 1 and 2, respectively, which are responsible for the stabilization of the complex formation. The calculated absorption bands are located at 304 and 235 nm, which are in excellent agreement with the experimental result. Moreover, the DFT study of the electronic spectra of both complexes shows that the calculated absorption bands are in well agreement with the experimental results. In the electrical studies, direct current (dc) measurements on the copper/complex (1 or 2)/copper structure confirm a definite development in the device current with applied bias. Complex 1 has shown better electrical conductance compared to complex 2 based on the reduction of device resistance. [ABSTRACT FROM AUTHOR]

Highlights Functionalized thin films with excellent flexibility and conductivity can meet the current requirements for electromagnetic(EM) shielding materials. In this paper, 2D transitions metal carbide and nitride nanomaterials Ti3C2Tx MXene were prepared by chemical exfoliation, and PVDF/MWCNTs/3 wt%/RGO@Fe3O4@ AgNWs‐10 based on PVDF/MWCNTs‐3 wt%/RGO@Fe3O4@AgNWs‐10, The samples were prepared through a simple solution mixing process followed by vacuum‐assisted filtration (VAF), and PVDF/MWCNTs/MXene/RGO@Fe3O4@AgNWs three‐layer PVDF‐based composite films, which were analyzed for electrical conductivity and EM shielding properties, which increased and then decreased with the rise in the Ti3C2Tx MXene content, in which the highest electrical conductivity of the three‐layer composite films of M3/MX‐10/R@F@Ag was obtained when the Ti3C2Tx MXene addition amount reached 10 mL as 3.9 × 103 S/m, the EMI SET is 54.9 dB, the EMI SEA is 44.8 dB, the absorption loss is 81.6%, and the SSEt of the M3/MX‐10/R@F@Ag three‐layer composite film is the highest 1672.5 dB/(cm−2·g). And the SEA/SER ratios of the M3/MX‐X/R@F@Ag three‐layer composite films are all greater than 1. The result shows that the EM attenuation mechanism of the M3/MX‐X/R@F@Ag three‐layer composite films is primarily driven by absorption loss and that the incorporation of Ti3C2Tx Mxene improves the EM shielding performance of the composite films. The relatively novel exploration of the performance study and structural design of the M3/MX‐X/R@F@Ag three‐layer EM shielding composite film provides structural design and research ideas for the application of the new MXenes material in EM shielding composites. The addition of Ti3C2Tx MXene will generate more conductive network nodules A complete 3D conductive network is constructed in the membrane This paper discusses the influence of Ti3C2Tx MXene on EM shielding Multiple internal reflections of EMW between Ti3C2Tx MXene 2D nanosheets The EM shielding mechanism of the film is discussed from the angle of 3D [ABSTRACT FROM AUTHOR]

Higher Manganese Silicides (HMS) are the best p-type materials beneficial for intermediate-temperature range thermoelectric device applications due to their high thermal stability and inexpensive constituent elements. Although the cost-effective HMS materials possess high thermal stability, they are concerned with high thermal conductivity values. The nanocomposite approach was promised to lower the thermal transport properties without affecting the electrical transport properties, which is experimented in the present work. The higher manganese silicide with varying weight percentages of nano-structured Si 0.8 Ge 0.2 B 0.02 inclusions was experimented to decrease the thermal conductivity and to enhance the electrical properties. The lowest thermal conductivity value of ≃ 2.24 W/mK was reported with 2 wt% Si 0.8 Ge 0.2 B 0.02 addition in HMS material. Also, the HMS-2 wt. % Si 0.8 Ge 0.2 B 0.02 improved the transport properties, electrical conductivity and Seebeck coefficient values of ≃ 4 × 104 S/m and ≃ 220 μV/K respectively. Furthermore, various mathematical models were proposed here to simulate the composite approach results, which were then correlated with experimental results. [ABSTRACT FROM AUTHOR]

Lanthanum nickel oxide (LaNiO 3, LNO) films exhibit excellent electrical conductivity but poor mechanical properties, considerably limiting their further development in the field of flexible electronics. In this study, flexible LNO thin films of different thicknesses were fabricated on a unique two-dimensional (2D) mica platform using a simple metal organic deposition technique. The obtained LNO films exhibited a pseudocubic phase without impurities. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) characterisations proved that the films were well-crystallised, dense, and flat, with controllable thickness. In addition, the flexible LNO/mica element possesses low resistivity (5 × 10−4 Ω cm), translucency, and good bending resistance. The electrical resistivity can remain stable under various bending radii (r = 10∼2 mm), thousands of bending cycles, and a wide temperature range (28–200 °C), demonstrating good durability, mechanical stability and temperature resistance. Furthermore, a ferroelectric BiFeO 3 film was constructed based on the obtained conductive LNO electrode, which exhibited typical ferroelectric characteristics. This excellent performance suggests that the flexible LNO electrode is promising for flexible electronic applications. [ABSTRACT FROM AUTHOR]

This study investigated the effect of TiO 2 content on the viscosity, free running temperature, electrical conductivity, crystallization behavior, and structure of high-titanium CaO–SiO 2 -10 wt% MgO-13 wt%Al 2 O 3 –TiO 2 -4 wt.% FeO slag by experiments and molecular dynamics simulations. The results revealed that increasing TiO 2 weakened the overall bonding energy and simplified the slag structure, leading to a decrease in viscosity and an increase in electrical conductivity. Thermodynamic calculations revealed a continuous enrichment of the slag towards the pseudobrookite region with increasing TiO 2 content. The precipitation of pseudobrookite phase during cooling resulted in short-slag characteristics and a rising free running temperature. Additionally, the peak intensity of pseudobrookite phase gradually enhanced and its morphology changed from elongated strips to plates with higher TiO 2 concentration. Structural analysis demonstrated that the poorly stabilized [TiO 6 ] octahedron was the major form of Ti atoms in the slag, and its proportion progressively increased with increasing TiO 2 content. [ABSTRACT FROM AUTHOR]

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Highlights In this research, we demonstrate the influence of compelled iron nanoparticles (FeNPs) up to the surface on the percolation phenomenon and the electrical conductivity of the PEO/FeNPs nanocomposite films by applying a uniform magnetic field. The electrical conductivity of the PEO/FeNPs nanocomposite films exhibits a sharp increase from 1.19×10−5$$ 1.19\times {10}^{-5} $$ to 390 S∙cm−1 as the FeNPs volume fraction rises from 0.12 to 0.24, where the FeNPs form percolating networks and interparticle contacts. Applying a magnetic field drives the FeNPs towards the surface of the PEO/FeNPs nanocomposite films and consequently increases the electrical conductivity of the PEO/FeNPs nanocomposite films up to 1960 S∙cm−1. The morphological features of the PEO/FeNPs nanocomposite films with different concentrations of FeNPs upon applying a magnetic field towards the surface were investigated. Finally, the corrosion protection efficiency of PEO/FeNPs nanocomposite films increases as FeNPs increase from an insulating zone to a conductive zone. On the other hand, applying a magnetic field drives the FeNPs towards the PEO/FeNPs nanocomposite surfaces, increasing the corrosion protection efficiency from 92.67% to 98.09%. The nanoparticle positioning effect on nanocomposite films is investigated. The electrical conductivity of PEO/FeNPs nanocomposite film reaches 390 S∙cm−1. Electrical conductivity increases to 1960 S∙cm−1 upon nanoparticle positioning. Corrosion protection efficiency increases to 98.09% after nanoparticle positioning. [ABSTRACT FROM AUTHOR]

Currently, with the development of many important fields such as aerospace and automotive industries, polymer composites have become an indispensable part of these fields. As for preparation methods, common methods like hot pressing make composites difficult to achieve continuous production. This paper proposed the continuous forced assembly (CFA) and designed continuous production facility, which can achieve the continuous preparation of low filler content (30 wt%) composites with high electrical/thermal conductivity. Besides, we structurally designed roll pressing device and explored its effect on the machining process. Here, short cut carbon fiber (SCF) and solid silica gel (MVQ) are used as electrically/thermally conductive filler and polymer matrix respectively, and continuous preparation of functional composites is completed by CFA method. Compared to the thermal conductivity (1.186 W/(m·K)) of SCF/MVQ composites prepared with lower viscosity matrix (MVQ‐A), the thermal conductivity of composites prepared with high viscosity matrix (MVQ‐D) reached 2.230 W/(m·K). Meanwhile, the process is optimized to explore the effects of the "accordion folding" and "pre‐stretch" methods on the thermal conductivity of composites, the thermal conductivity is converted from in‐plane to vertical direction. In addition, under the same filler content, 2 wt% rGO is beneficial in enhancing the electrical/thermal conductivity of prepared composites. The electrical conductivity and thermal conductivity of SCF28/rGO2/MVQ composite reach 663 S/m and 2.82 W/(m·K), which is higher than that of the properties of SCF/MVQ composite with the same filler content. To sum up, CFA facilitates continuous production of composites, which can be used in thermal management materials (TMMs). Highlights: Compared with the "pre‐stretch" method, the thermal conductivity of SCF/MVQ composites prepared by "accordion folding" has a significant improvement.The SCF/rGO/MVQ composites prepared by CFA method show superior thermal conductivity and electrical conductivity.Composites prepared by CFA method can realize the continuous preparation of functional materials. [ABSTRACT FROM AUTHOR]

Cooling water towers are commonly used in industrial and commercial applications. Industrial sites frequently have harsh environments, with certain characteristics such as poor air quality, close proximity to the ocean, large quantities of dust, or water supplies with a high mineral content. In such environments, the quality of electrical conductivity in the cooling water towers can be significantly negatively affected. Once minerals (e.g., calcium and magnesium) form in the water, conductivity becomes too high, and cooling water towers can become easily clogged in a short time; this leads to a situation in which the cooling water host cannot be cooled, causing it to crash. This is a serious situation because manufacturing processes are then completely shut down, and production yield is thus severely reduced. To solve these problems, in this study, we develop a practical designation for a photovoltaic industry company called Company-L. Three control methods are proposed: the motor control method, the PID control method, and the fuzzy PID control method. These approaches are proposed as solutions for successfully controlling the forced replenishment and drainage of cooling water towers and controlling the opening of proportional control valves for water release; this will further dilute the electrical conductivity and control it, bringing it to 300 µS/cm. In the experimental processes, we first used practical data from Company-L for our case study. Second, from the experimental results of the proposed model for the motor control method, we can see that if electrical conductivity is out of control and the conductivity value exceeds 1000 µS/cm, the communication software LINE v8.5.0 (accessible via smartphone) displays a notification that the water quality of the cooling water towers requires attention. Third, although the PID control method is shown to have errors within an acceptable range, the proportional (P) controller must be precisely controlled; this control method has not yet reached this precise control in the present study. Finally, the fuzzy PID control method was found to have the greatest effect, with the lowest level of errors and the most accurate control. In conclusion, the present study proposes solutions to reduce the risk of ice-water host machines crashing; the solutions use fuzzy logic and can be used to ensure the smooth operation of manufacturing processes in industries. Practically, this study contributes an applicable technical innovation: the use of the fuzzy PID control model to control cooling water towers in industrial applications. Concurrently, we present a three-tier monitoring checkpoint that contributes to the PID control method. [ABSTRACT FROM AUTHOR]

Polymer-modified fertilizers (PMFs) with prolonged nutrient release present a promising solution to address the challenges associated with conventional fertilization practices, particularly for sensitive crops such as strawberries. This study investigates the effectiveness of biodegradable PMFs in maintaining nutrient availability at optimal levels while minimizing root burn and nutrient losses. In a factorial field experiment, we obtaineda total of 3780 sets of parallel measured time series for soil EC, moisture, and temperature as well as two sets of harvest data to evaluate the impact of varying concentrations of polyvinyl alcohol (PVA) on the nutrient release rates from complex NPK fertilizer and monoammonium phosphate. Results indicate that polymer modifications significantly slow down nutrient release, leading to optimal salt levels and maximizing yield while remaining low enough to prevent the risk of root burn (EC of soil solution below 1 mS/cm). Consequently, the application of PMFs enhances strawberry yield surplus (on average 2.8 times in the second harvest) by ensuring a steady supply of nutrients throughout the growing season without inducing stress, which reduces the yield by nearly half. This research provides valuable insights into the development of more effective fertilization strategies for strawberry cultivation and other sensitive crops using PMFs. [ABSTRACT FROM AUTHOR]

This study focuses on the ionic contribution by a chiral dopant added into a nematic host for preparing cholesteric liquid crystals (CLCs). Chiral structures were designated by individually incorporating two enantiomers, R5011 and S5011, into the nematic E44 to construct right- and left-handed CLCs, respectively. Characterized by the space-charge polarization, the dielectric spectra of the CLCs were investigated in the low-frequency regime, where f  ≤  1 kHz. The role of the individual chiral dopant, R5011 or S5011, at concentrations of 0–4.0 wt.% in altering the ionic properties of the CLC material was analyzed by deducing the electrical conductivity, ion density, and ion diffusivity. Regardless of the cell structure to be antiparallel or twisted by 90°, a significant ionic response was observed in the right-handed CLCs in comparison with the left-handed counterparts, suggesting that excess ions originating from our R5011 were introduced into the mesogenic mixtures. This work alarms the potential contribution of notorious impurity ions by a chiral dopant, which is often ignored in fabricating CLCs for electro-optical applications. [ABSTRACT FROM AUTHOR]

Generating high magnetic fields requires materials with not only high electric conductivity but also good strength properties in order to withstand the necessarily strong Lorentz forces. A number of bi-metal composites, most notably Cu/Nb, are considered to be good candidates for this purpose. Here, we generalize our previous work on Cu/Nb in order to predict, from theory, the dependence of electric conductivity on the microstructure and volume fraction of the less conductive component for a number of other bi-metal composites. Together with information on strength properties (taken from previous literature), the conductivity information we provide in this work can help to identify new promising candidate materials (such as Cu/Nb, Cu/Ag, Cu/W, ...) for magnet applications with the highest achievable field strengths. [ABSTRACT FROM AUTHOR]

This article contains an advanced analysis of the properties of solid wire electrical contacts produced by ultrasonic welding, both with and without varnish. The main disadvantage of ultrasonic welding of thin wires is the inability to achieve acceptable peel force and tensile strength, which is mainly due to the deformation and thinning of the wires. This study deals with ultrasonic welding using a ring of thin solid copper wires that minimises the deformation and thinning of the wires. The influence of welding parameters such as energy, pressure and amplitude were systematically analysed. Based on these parameters, the optimum welding programme and control method was determined to weld unvarnished and varnished wires. The investigations included electrical resistance tests, optical microscopy, micro-hardness measurements, peel tests and tensile tests, and the measurement of energy consumption. The results showed no significant differences in microstructure and hardness between varnished and unvarnished joints. Ultrasonic joints of varnished wires achieved lower electrical conductivity (by 38%), lower tensile strength (by 3%) and higher peel strength (by 7%), while the welding process was more sustainable in terms of energy (by 6.6%) and time consumption (without preprocessing). [ABSTRACT FROM AUTHOR]

Herein, the impact of exposing the perovskite compound Pr0.5Sr0.5MnO3 to oxygen plasma is explored by comparing the structural and transport properties of the exposed samples to those of the unexposed ones. The Pr is oxidized to PrO2 in the investigated samples due to plasma exposure. The alterations in the transport properties can be linked to the changes in MnOMn bond angle and MnO bond length due to plasma exposure, as indicated by X‐ray diffraction analysis. Additionally, exposure to oxygen plasma increases the conductivity by incorporating oxygen into the exposed samples, making them oxygen‐rich. Detailed analysis of the resistivity and thermoelectric power data indicates that small polarons are responsible for conduction at high temperatures, while at low temperatures, variable range polarons take over. The negative value of the thermopower at all temperatures proclaims that the electrons behave as the dominant charge carriers. [ABSTRACT FROM AUTHOR]

The positron annihilation lifetime (PAL) spectroscopy characteristics of ethylene-propylene-diene monomer rubber (EPDM) composites reinforced with treated wheat husk fibers (WHFs) were investigated for the first time. PAL spectroscopy is employed to study the free volume of polymers. The use of lignocellulosic materials as reinforcement in polymeric composites has gained attention due to their low cost, availability, and eco-friendliness. In this study, the impact of the loading concentration on the interfacial adhesion between the EPDM matrix and WHFs is quantified, along with the evaluation of swelling measurement and tensile properties. Additionally, the nanoscopic properties derived from PAL spectroscopy correlate with the composites' macroscopic properties. In addition, the dielectric properties of the investigated samples have been studied, and their conductivity has been calculated. To determine the conduction mechanism within these samples and how it is affected by the addition of WHF, the change in electrical conductivity with the frequency of the external electric field applied to the samples was studied, and from this, the conduction mechanism was determined, and the barrier height value was calculated. The experimental results provide insights into the relationship between the structure and properties of EPDM-WHF biocomposites, offering valuable knowledge for developing sustainable and high-performance materials. [ABSTRACT FROM AUTHOR]

The synthesis of transparent thermoelectric materials, particularly at low processing temperature possesses a good promise for future power generation by renovating waste heat into electrical energy. The fabrication of invisible thermoelectric module is hindered by limited choices of appropriate p-type transparent thermoelectric materials so far. The present study deals with the growth and characterization of optically transparent p-type copper iodide (γ-CuI) thin films. Thermal annealing (maximum up to 200 °C) was performed to tune the electrical and optoelectronic properties for nurturing the thermoelectric performance. Annealing induced microstructural modifications instigated the preferential crystal growth by regulating the surface morphology. Low thermal conductivity is credited to strong phonon scattering leading to improved thermoelectric performance. Consequently, we attain a record Seebeck coefficient of ∼270 μV/K and power factor of ∼20 μW/(m·K2) that is almost two-order of magnitude higher as compared to conventional p-type transparent TE materials, indicating the potential of transparent γ-CuI thin films regarding its practical applicability in transparent thermoelectric devices. [ABSTRACT FROM AUTHOR]

Developing solid-state ionic conductors with desirable charge-transport efficiency and reasonable durability is a fundamental and long-lasting challenge for solid-oxide fuel cells (SOFCs). Ceria-based electrolytes, as one of the most common types of electrolytes for intermediate-temperature solid-oxide fuel cells (IT-SOFCs), offer a high surface-exchange coefficient and faster kinetics in the triple phase boundaries (TPBs); however, they suffer to some extent of electronic conductivity in the reducing atmosphere and gradual phase transitions. Here in this work, we have reported a novel co-doped IT-SOFC electrolyte composite combining the apatite structure of Lanthanum Silicate (LSO) with the fluorite structure of Gadolinium-doped Ceria (GDC), which showed a high ionic conductivity and a minimal electronic leak. The resulting GDC-LSO composite electrolyte also achieved an OCV (open-circuit voltage) of 1 V at 800 °C, implying a significant improvement in the OCV values reported for the typical ceria-based electrolytes (∼0.75 V). The sample was prepared using 40 wt% GDC and 60 wt% LSO (40GDC-60LSO) showed a maximum electrical conductivity of 25 mS cm−1 at 800 °C with good densification properties (>95 % relative density). The cell electrochemical performance measurement was conducted using a 3.0 vol% humified H 2 stream at the anode side while the cathode side was exposed to the air at 800 °C. The interdiffusion of cations between La3+ in the LSO phase and Ce4+ and Gd3+ in the GDC phase was detected by XRD and EDX results after sintering samples at 1500 °C for 4 h using 0.5 wt% PVA or 0.5 wt% Ethyl cellulose (EC) as the binder. The proposed GDC-LSO composite could help better understand the influence of compositional constituents and processing variables on the densification and electrical properties of the electrolyte materials for the IT-SOFCs. [ABSTRACT FROM AUTHOR]

Groundwater salinization is a crucial socio-economic and environmental issue that is significant for a variety of reasons, including water quality and availability, agricultural productivity, health implications, socio-political stability and environmental sustainability. Salinization degrades the quality of water, rendering it unfit for human consumption and increasing the demand for costly desalination treatments. Consequently, there is a need to find simple, sustainable, green and cost-effective methods that can be used in understanding and minimizing groundwater salinization. Therefore, this work employed the implementation of cost-effective neurocomputing approaches for modeling groundwater salinization. Before starting the modeling approach, correlation and sensitivity analyses of the independent and dependent variables were conducted. Hence, three different modeling schema groups (G1–G3) were subsequently developed based on the sensitivity analysis results. The obtained quantitative results illustrate that the G2 input grouping depicts a substantial performance compared to G1 and G3. Overall, the evidential neural network (EVNN), as a novel neurocomputing technique, demonstrates the highest performance accuracy, and has the capability of boosting the performance as against the classical robust linear regression (RLR) up to 46% and 46.4% in the calibration and validation stages, respectively. Both EVNN-G1 and EVNN-G2 present excellent performance metrics (RMSE ≈ 0, MAPE = 0, PCC = 1, R2 = 1), indicating a perfect prediction accuracy, while EVNN-G3 demonstrates a slightly lower performance than EVNN-G1 and EVNN-G2, but is still highly accurate (RMSE = 10.5351, MAPE = 0.1129, PCC = 0.9999, R2 = 0.9999). Lastly, various state-of-the-art visualizations, including a contour plot embedded with a response plot, a bump plot and a Taylor diagram, were used in illustrating the performance results of the models. [ABSTRACT FROM AUTHOR]

La10−xNdxSi6O27 (x = 0, 0.1, 0.2, 0.3) was synthesized via planetary grinding, and dense ceramic discs were prepared using SPS technology. The structure, microstructure, density, open porosity, total conductivity and electronic conductivity of the samples were measured and analyzed, respectively. La10−xNdxSi6O27 is characterized by a hexagonal apatite structure. The elements in the sample are distributed in a uniform manner and the content is consistent with the stoichiometry. The total conductivity of La10−xNdxSi6O27 exhibits an increase with the incorporation of Nd3+ content in the doped samples of x = 0.1, 0.2, and 0.3. The total conductivity of La9.7Nd0.3Si6O27 is the highest, reaching 5.39 × 10−3 S cm−1 at 850 °C. The electron mobility of the sample is less than 1%, which is suitable for use as a solid electrolyte. [ABSTRACT FROM AUTHOR]

In this study, we thoroughly explored the thermal transport and thermoelectric properties of BN-co-doped phagraphene structures in the context of first-principles computations combined with machine learning interatomic potential (MLIP) techniques. Our results demonstrate that doping positions can critically tune the thermal properties, offering potential advantages for both thermoelectric and heat transfer applications. Notably, enhanced thermal conductivity has been obtained for phagraphene with 10 % co-doping. Additionally, the rectangular structural symmetry of phagraphene plays an important role for targeted thermal transport. Further, we observe negative Grüneisen parameter in these structures, suggesting negative thermal expansion. This will serves as an unique mechanism for controlling the thermal conductivity at different frequencies. Interestingly, n-type behavior of the structures is indicative of its negative Seebeck coefficient within the temperature range of 300–900 K. Moreover, these structures display significantly larger electrical conductivity compared to other two-dimensional (2D) materials. Apart from that, the calculated figure of merit of the structures under a constant relaxation time at 300 K shows considerably better response for some specific doped structures. We believe this study will play an important role in understanding the importance of structural modifications in tailoring the thermal properties of carbon-based 2D systems. [ABSTRACT FROM AUTHOR]

By using the density functional theory (DFT) in combination with Boltzmann transport theory, the influence of Mg concentrations (x) doping on the thermoelectric properties of Hg 1 − x MgxSe ternary alloys was systematically investigated. The generalized gradient approximations of Perdew–Burke–Ernzerhof (GGA-PBE) have been used to illustrate the exchange correlation potential. The thermodynamic stability of the studied compounds was analyzed in terms of formation energy. Various thermoelectric transport parameters, such as the Seebeck coefficient (S), the thermal conductivity over relaxation time (k/ τ), the electrical conductivity over relaxation time (σ / τ), the power factor (PF) and the figure of merit (ZT) have been deduced and discussed. The obtained results of thermoelectric properties show that the studied materials can be useful for thermoelectric devices at room temperature. It can also be seen that Mg concentrations can increase the thermal efficiency of the HgSe alloy. [ABSTRACT FROM AUTHOR]

Developing novel anodes with outstanding fast‐charging properties is crucial for next‐generation energy storage research. Sb2S3 materials are deemed promising electrodes due to their high theoretical specific capacity. However, they are restricted by sluggish bulk‐phase kinetics, bringing about inferior electronic conductivity at high current density. In this work, the cable‐like SS@C‐x anodes are successfully prepared via the thermal‐chemical treatment method. Through the tailoring of habit modifiers, their unique core–shell architectures are induced with (hk1) preferential planes and the construction of S‐defects, accompanied by lowered energy barriers. Meanwhile, assisted by C─S and C─O─Sb bonds, the charge accumulation on the surface can be rapidly released toward the bulk phase. As expected, for the as‐optimized samples, the capacity of 603.7 mAh g−1 can remain after 100 cycles at 1.0 A g−1. Even at 10.0 A g−1, their superior capacity of 436.1 mAh g−1 can be noted, and it still displayed the reversible capacity of 479 mAh g−1 at −5 °C. Assisted by kinetic analysis, the great electrochemical properties mainly come from the reduced migration energy barriers and accelerated Li+ diffusion rates. Given this, the work is expected to shed light on crystal orientation tuning and defect engineering for advanced metal‐based energy storage materials. [ABSTRACT FROM AUTHOR]

The electrical conductivity of pure and Al/Fe‐bearing phase E was measured up to 950 K at 15 GPa using a complex impedance spectroscopy. Pure phase E shows comparable conductivity to that of phase D, and a few orders of magnitude higher than that of phase A and super‐hydrous phase B. Al‐bearing phase E does not exhibit a conductivity difference, while a certain amount of incorporated Fe prominently increases its electrical conductivity by a factor of 4. Unlike the sole substitution 2Al3+→Mg2++Si4+ in phase D and H, H+ is likely involved in the substitution. Proton conduction is the dominant conduction mechanism, while small polaron conduction becomes dominant with increasing Fe content. Phase E in subducted slabs at depth of the upper transition zone cannot explain the high electrical conductivity anomalies beneath the Philippine Sea or Northeast China. Other mechanisms such as dehydration of hydrous minerals is needed to account for them. Plain Language Summary: Some subduction zones exhibit anomalously higher electrical conductivity compared to the average value of mantle, which may be due to the existence of hydrous minerals, of free water from dehydration, or of a small fraction of melt. If it remains a relatively low temperature below the choke point inside the slab during descending, dense hydrous magnesium silicates are potential candidates explaining the high conductivity anomalies. Impedance spectroscopy experiments are effective way to determine the electrical conductivity of the hydrous minerals. Combined with multi‐anvil apparatus, and the results at high pressure and high temperature can be directly applied to Earth's mantle condition. In this study, we synthesized pure and Fe/Al bearing phase E and measured the electrical conductivity. The Fe/Al substitution mechanism and conduction mechanism have been discussed. Applying our conductivity results to the depth of upper transition zone, we found that the high conductivity anomalies cannot be explained by the existence of phase E. Therefore, other mechanisms are needed, such as an existence of free water from dehydration, or an existence of melt. Key Points: The electrical conductivity of pure and Al/Fe‐bearing phase E was measured up to 950 K at 15 GPaIncorporation of Fe prominently increases its electrical conductivity by a factor of 4Phase E in subducted slabs cannot explain the high electrical conductivity anomalies beneath the Philippine Sea or Northeast China [ABSTRACT FROM AUTHOR]

This study analyzed the effect of the application of a soil conditioner under the trade name of the Agro Mineral Product (AMP) in the winter rapeseed cultivation on the bacterial and fungal abundance, ion concentrations, and electrolytic conductivity of the soil solution. It was demonstrated that the AMP influenced changes in the total abundance of the culturable fractions of the soil bacteria and fungi at each of the tested time points. A stimulatory effect of the preparation on the growth of the soil bacteria and an inhibitory effect on the development of the fungi was observed, particularly at doses of 4 and 8 t·ha−1. A dose of 12 t·ha−1 proved to be the least effective in relation to the development of the soil microbiome. Increasing the AMP fertilization dose above 4 t·ha−1 caused changes in the chemistry of the soil solution (pH, EC, HCO3−, K+, and PO4-P). It is worth noting that this primarily resulted in decreases in the amounts of mobile forms of potassium (from 40.4 mg·dm−3 in the control to 26.7 mg·dm−3 at the 8 t·ha−1 dose) and orthophosphate as phosphorus (from −6.00 mg·dm−3 in the control to 3.75 mg·dm−3 at the 8 t·ha−1 dose) in the soil solution, which resulted in a reduction in the yield of the winter rapeseed (from 4.76 t·ha−1 in the control to 4.61 t·ha−1 at the 8 t·ha−1 and 4.43 t·ha−1 at the 12 t·ha−1 AMP dose). [ABSTRACT FROM AUTHOR]

In this work, a series of electrical conductivities of pyrite-bearing dacite were measured under 10−1–106 Hz, 573–973 K, 1.0–3.0 GPa, and different pyrite contents ranging from 0 vol.% to 20 vol.%) using a Solartron–1260 A impedance analyzer. For the dacite sample with 5 vol.% pyrite, the electrical conductivity of the dacite increased with temperature but slightly decreased when the pressure was increased from 1.0 GPa to 3.0 GPa. In the temperature range of 573–973 K, the bulk electrical conductivity of the pyrite-bearing dacite gradually increased with increasing pyrite percentage from 0 vol.% to 20 vol.% at 1.0 GPa. Thus, a positive correlation between the electrical conductivity of the sample and the pyrite content was typically observed. In light of the significant enhancement in the electrical conductivity of the interconnected pyrite in the dacite, the value of the percolation threshold was determined as 7 vol.%. Furthermore, the dominant conduction mechanism of the small polaron for pyrite-bearing dacite was proposed from our obtained results on the chemical compositions and activation enthalpies under high-temperature and high-pressure conditions. A comprehensive consideration of our constructed electrical conductivity–depth profile based on the electrical conductivity of the pyrite-bearing dacite, can provide a good constraint on the volume of pyrite in dacite for high-conductivity Duobaoshan island arc. In conclusion, the presence of pyrite in dacite can provide a reasonable explanation for the high-conductivity anomaly observed in the region of Duobaoshan island arc. [ABSTRACT FROM AUTHOR]

Thermosensitive polymers P1–P6 of N-isopropylacrylamide (PNIPA) and poly(ethylene glycol) dimethacrylates (PEGDMAs), av. Mn 550–20,000, were synthesized via surfactant-free precipitation polymerization (SFPP) using ammonium persulfate (APS) at 70 °C. The polymerization course was monitored by the conductivity. The hydrodynamic diameters (HDs) and the polydispersity indexes (PDIs) of the aqueous dispersion of P1–P6 in the 18–45 °C range, assessed via dynamic light scattering (DLS), were at 18° as follows (nm): 73.95 ± 19.51 (PDI 0.57 ± 0.08), 74.62 ± 0.76 (PDI 0.56 ± 0,01), 69.45 ± 1.47 (PDI 0.57 ± 0.03), 196.2 ± 2.50 (PDI 0.53 ± 0.04), 194.30 ± 3.36 (PDI 0.56 ± 0.04), 81.99 ± 0.53 (PDI 0.56 ± 0.01), 76.87 ± 0.30 (PDI 0.54 ± 0.01), respectively. The electrophoretic mobilities estimated the zeta potential (ZP) in the 18–45 °C range, and at 18 °C they were as follows (mV): −2.57 ± 0.10, −4.32 ± 0.67, −5.34 ± 0.95, −-3.02 ± 0.76, −4.71 ± 2.69, −2.30 ± 0.36, −2.86 ± 0.42 for polymer dispersion P1–P6. The polymers were characterized by attenuated total reflectance–Fourier transform infrared spectroscopy (ATR-FTIR), H nuclear magnetic resonance (1H NMR), thermogravimetric analysis (TG/DTA), Differential Scanning Calorimetry (DSC), and powder X-ray diffraction analysis (PXRD). The length of the cross-linker chain influences the physicochemical properties of the obtained polymers. [ABSTRACT FROM AUTHOR]

The processing conditions were varied during the production of polycarbonate-based composites with the multiwalled carbon nanotubes (MWCNTs) Baytubes® C150 P (Bayer MaterialScience AG, Leverkusen, Germany), by melt mixing with an extruder on a laboratory scale. These included the screw design, rotation speed, throughput, feeding position and MWCNT content. Particular attention was paid to the shortening of the MWCNT length as a function of the conditions mentioned. It was found that there is a correlation between the applied specific mechanical energy (SME) during the melt mixing process and MWCNT dispersion, which was quantified by the agglomerate area ratio of the non-dispersed nanotubes based on optical microscopic analysis. The higher the SME value, the lower this ratio, which indicates better dispersion. Above an SME value of about 0.4 kWh/kg, no further improvement in dispersion was achieved. The MWCNT length, as measured by the quantitative analysis of TEM images of the MWCNTs dissolved from the composites, decreased with the SME value down to values of 44% of the original MWCNT length. At a constant loading of 3 wt.%, the tensile strength and tensile modulus were almost independent of the SME, while the elongation at break and notched impact strength showed an increasing trend. The variation in the feeding position showed that feeding the MWCNTs into a side feeder led to slightly better electrical and mechanical properties for both types of MWCNTs studied (Baytubes® C150 P and Nanocyl™ NC7000 (Nanocyl S.A., Sambreville, Belgium)). However, feeding into the hopper led to better CNT dispersion with Baytubes® C150 P, while this was the case with Nanocyl™ NC7000 when feeding into the side feeder. The screw profile had an influence on the dispersion, the MWCNT length and the electrical resistance, but only to a small extent. Distributive screws led to a greater shortening of the MWCNT length than dispersive screws. By varying the MWCNT content, it was shown that a greater MWCNT shortening occurred at higher loadings. Two-stage masterbatch dilution leads to stronger shortening than composite production with direct MWCNT incorporation. [ABSTRACT FROM AUTHOR]