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A material that composed a components either nanoscale or nano-sized and have improved dielectric characteristics is called a nanocomposite material for dielectric applications. Dielectric materials can sustain an electric field with little energy loss since they are non-conductive. This study examined in detail the optical, morphological, and structural characteristics of materials made of tin dioxide/graphene oxide (SnO2/GO), with an emphasis on the potential uses of these materials as dielectrics. The crystalline nature of the materials was revealed by using X-ray diffraction (XRD) to clarify the structural properties of the produced nanocomposites. This was done in a systematic manner. For the purpose of enhancing dielectric characteristics, morphological investigations using scanning electron microscopy (SEM) reveal a well-dispersed and linked structure. A significant defect density is discovered in the composite, and the energy dispersive X-ray spectroscopy (EDX) spectrum's exclusive Tin (Sn), carbon (C), and oxygen (O) content confirms the originality of the sample. The optical properties of the nanocomposites were studied using photoluminescence (PL) measurements, and ultraviolet-visible spectroscopy (UV-Vis) of the nanocomposite revealed a 3.7 eV energy of the band gap that is consistent with SnO. The tiny high fault density and grain size are in charge of the dielectric constant's observable increase. The synthesized SnO2/GO nanocomposite shows promising properties use in dielectric applications. [ABSTRACT FROM AUTHOR]

The article discusses the processes of formation of impurity accumulations in silicon, simultaneously doped with impurity atoms of nickel and iron at a temperature of T = 1473 K. The structural structures and elemental composition of impurity accumulations, which have different morphological parameters, are studied. The results of structural analyzes showed that the formation of any massive accumulations of impurity atoms was not observed in the volume of the initial samples. Unlike the original samples, in the volume of n-Si samples, the formation of accumulations of impurity atoms of various geometric shapes is observed, the sizes of which reach up to several hundred nanometers. It has been revealed that in the volume of impurity accumulations, in addition to atoms of the matrix element silicon and the main impurities of nickel and iron, there are also atoms of so-called technological impurities such as carbon and oxygen. Analyzes of the chemical composition of an impurity accumulation with a spherical shape, the diameter of which is 400 nm, showed that in the central region of this impurity accumulation the percentage of impurity Ni atoms is 30.76 %, and iron atoms are 16.34 %. Also presented are the results of studies of the effect of thermal annealing on the resistivity of n-Si samples at temperatures T = 673 ÷ 1273 K in a time interval of 10 ÷ 120 minutes, followed by sharp quenching. As it turned out, in the dependences of the relative resistivity of n-Si samples on the duration of the annealing time, a certain tendency is observed, according to which, with increasing annealing temperature, the maximum in the dependence curves occurs at a shorter annealing time. Using electron microscopy, structural analyzes of the state of impurity accumulations before and after exposure to thermal annealing were carried out. [ABSTRACT FROM AUTHOR]

This article presents samples of bismuth ferrite developed and synthesized by the authors using the solgel method. SEM images of such samples were obtained. The data from X-ray diffraction analysis and thermodynamic properties of these bismuth ferrites were studied. It was found that samples annealed at different temperatures have a granular microstructure with granule sizes from 20 to 100 nm. On a scale above 200 nm, all samples are morphologically indistinguishable. The X-ray diffraction study discovered the crystallinity of bismuth ferrites at a scale level of less than one nanometer. The sizes of nanocrystallites of bismuth ferrite and overall structural heterogeneity decrease with increasing annealing temperature. The thermodynamic analysis found a significant decrease in heat capacity, enthalpy, entropy and modulus of the Gibbs energy of the samples under study with an increase in the annealing temperature. This indicates an improvement in the structure due to reducing heat loss on structural defects. A direct correlation between the level of X-ray scattering on the studied samples and the thermodynamic properties of bismuth ferrites was established. There is reason to believe that by selecting an appropriate annealing temperature, it is possible to regulate the nanocrystallinity and thus other physical properties of bismuth ferrites. [ABSTRACT FROM AUTHOR]

Lead-Barium-Titanate (PBT) ferroelectric ceramic has been synthesized by using solid state reaction technique with different sintering temperatures. Structure of the samples was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). XRD of the Pb-Ba-TiO3 samples confirms the tetragonal perovskite ferroelectric structure with lattice parameters in the range 3.94-3.987 Å and 4.068-4.22 Å, respectively. The grain growth increases with sintering temperature and the grain size of these samples is observed in the range 0.6-1.713 mm from SEM analysis. The absorption bands around 575 cm - 1 to 585 cm - 1 are assigned to the stretching vibrations of Ti-O bonds from FTIR analysis. The crystallite size (D), lattice constant (a), microstrain (ε), and dislocation density (ρD) are also reported. The Williamson-Hall plot and size-strain plot are also employed to understand the structural and mechanical attributes of ferroelectric samples. Thus, we report variation of structural and mechanical properties of PBT with respect to sintering temperature. [ABSTRACT FROM AUTHOR]

The article investigates the morphological features of the nanoporous structure in the ammonium nitrate granules obtained by the humidification method, followed by heat treatment, including final drying. The necessity to improve the basic scheme is substantiated using the "humidification-heat treatment" scheme in vortex granulators towards obtaining a developed network of nanopores. A comparative analysis regarding the morphology of the initial granules in ordinary ammonium nitrate, ammonium nitrate after heat treatment, ammonium nitrate after the "humidification-heat treatment" stages in a vortex granulator and ammonium nitrate after the "humidification-heat treatment-final drying" stages in a multistage shelf device is carried out. The obtained data form the basis to create an engineering calculation method for multistage dryers with vertical sectioning of the workspace included to units for producing 3D nanostructured layers on the surface and inside the ammonium nitrate granules. [ABSTRACT FROM AUTHOR]

Mg2+ and Zn2+ substituted manganese ferrite nanoparticles were synthesized by chemical coprecipitation route. The synthesized samples were characterized by powder X-ray diffraction which confirms the cubic spinel ferrite structure and the crystallite size is in nanoscale. High resolution transmission electron microscope and scanning electron microscope were used to examine the surface morphology. The elemental composition and purity of the sample were confirmed from energy dispersive X-ray spectroscopic analysis. The band gap energy determined from UV-Vis absorption spectra reveals the semiconducting behavior of both the samples. The optical parameters calculated from the UV-Vis absorption spectra show that MMF has better optical property compared to ZMF nanocrystallites. The magnetic parameters determined using vibrating sample magnetometer show low coercivity, low squareness ratio exhibiting superparamagnetic behavior of the Mg2+ and Zn2+ substituted manganese ferrite nanoparticles which are important for technological applications. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Nano- & Electronic Physics is the property of Sumy State University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Nano- & Electronic Physics is the property of Sumy State University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Nano- & Electronic Physics is the property of Sumy State University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)