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For printing the front side metallization of solar cells using the non-contact aerosol printer different silver inks with different rheological properties and silver components were tested. Both atomization methods of the aerosol printer are introduced and the optimized printing parameters are discussed. With the most suitable inks and printing parameters it was possible to achieve high aspect ratios within 2:1 up to 4:1 with small lateral resolutions. A particle-free ink and several particle-containing inks for example diluted screen printing pastes were tested as aerosol ink to evaluate the most feasible ink. According to these results it was possible to assess the most important properties for aerosol inks, which are necessary to obtain a good printability and well defined printed structures. High aspect ratios (AR) of 2:1 were achieved by aerosol printing with the pneumatic atomizer for the front side metallization grid of solar cells and efficiencies of 14-17 % were achieved. [ABSTRACT FROM AUTHOR]

Abstract: Cubic gallium oxynitride was synthesized using a solvothermal processing route. Crystal structure, chemical composition, optical properties and the influence of heat treatment in either reactive or inert atmospheres have been investigated. Despite a strongly distorted lattice revealed using X-ray diffraction, the Raman active modes of a cubic gallium oxynitride structure could be observed. With diffusive reflectance UV–Vis spectroscopy a band gap at around 4.8eV has been observed. Additionally, cathodoluminescence spectroscopy exhibited observable luminescence caused by defect-related transitions within the optical gap. Cathodoluminescence and photoluminescence spectra collected after heat treatments showed significant changes in the defect structure. In particular, for annealing in ammonia the main spectral modifications were related to the substitution of oxygen by nitrogen on anion sites. [Copyright &y& Elsevier]

With advancement of technology, requirements for light-emitting devices are increasing. Various types of packaging technologies have been suggested to improve the performance of light-emitting diode (LED). Among them, phosphor in glass (PiG) is attracting attention due to its manufactural facility and easily tunable characteristics. As PiG draws increasing attention, research on glass materials is also being actively conducted. However, studies about glass in the field of phosphor are mainly conducted on fabrication. Only a few studies about recycling have been reported. Thus, the objective of this study was to recycle waste glass discarded in other fields due to breakage and failure and use it to fabricate phosphor in glass. Cylindrical waste glass was pulverized into powder with an average size of 12 μm, mixed with a phosphor and sintered to be reborn as a phosphor in glass to broaden the recycling route for waste glass. [ABSTRACT FROM AUTHOR]

The title ceramics is prepared by sintering mixtures of commercially available MgAl2O4 powder and a solution of Eu(NO3)3 in EtOH (1100 °C, 5 h) followed by hot isostatic pressing (Ar, 1500 °C, 180 MPa, 15 h). [ABSTRACT FROM AUTHOR]

With advancement of technology, requirements for light-emitting devices are increasing. Various types of packaging technologies have been suggested to improve the performance of light-emitting diode (LED). Among them, phosphor in glass (PiG) is attracting attention due to its manufactural facility and easily tunable characteristics. As PiG draws increasing attention, research on glass materials is also being actively conducted. However, studies about glass in the field of phosphor are mainly conducted on fabrication. Only a few studies about recycling have been reported. Thus, the objective of this study was to recycle waste glass discarded in other fields due to breakage and failure and use it to fabricate phosphor in glass. Cylindrical waste glass was pulverized into powder with an average size of 12 μm, mixed with a phosphor and sintered to be reborn as a phosphor in glass to broaden the recycling route for waste glass. [ABSTRACT FROM AUTHOR]

Cubic gallium oxynitride is synthesized by solvothermal processing of a gallium ethylene diamine complex and H2O (autoclave, 200 °C, 1 d). [ABSTRACT FROM AUTHOR]

The specific locations of the anions—nitrogen and oxygen—in the crystallographic sites are not known in the spinel-type gallium oxonitride. We report here on an indirect method for determining the specific location of the light elements N and O in a defect spinel-structured gallium oxonitride, Ga2.79O3.05N0.76. The locations of elements that are adjacent in the periodic table (ΔZ=±1) are indistinguishable with conventional x-ray diffraction techniques. However, by examining the local electronic structure we show that the anions are spatially ordered such that R3m (no. 166) is the most appropriate defect-free space group. Finally, we determined the electronic band gap of Ga2.79O3.05N0.76 experimentally to be 2.95 ± 0.30, agreeing with our calculated value of 2.79 eV (direct) for Ga3O3N using a local density approximation functional including a semilocal potential modified from that of Becke and Johnson (the MBJLDA functional). [ABSTRACT FROM AUTHOR]

The structural and electronic properties of a spinel structure of Ga3NO3 are investigated. Comparison is made with zinc-blende and wurtzite GaN as well as with β-Ga2O3, all of which are important direct gap materials. It is suggested that spinel Ga3NO3 may be formed through an alloyed mixture of GaN and Ga2O3. Ga3NO3 is also predicted to be a direct gap material with a value lying close to its nitride counterparts. The calculated lattice constant of the spinel Ga3NO3 is in excellent agreement with the structure of a recently synthesized cubic gallium oxynitride phase with an identified elemental composition near Ga2.8N0.5O3.5. [Copyright &y& Elsevier]

In this work, waste medical masks collected from daily life usage were pyrolyzed and catalytically decomposed with perovskite-type La 0.6 Ca 0.4 Co 1– x Fe x O 3− δ pre-catalysts for co-production of carbon nanomaterials and H 2. The influences of catalysis reaction temperature and Co/Fe ratio in the investigated pre-catalysts on the yields and selectivity of the gaseous products and carbon deposition were systematically studied. The physicochemical characteristics of the produced carbon nanomaterials were comprehensively characterized by the state-of-the-art techniques. La 0.6 Ca 0.4 Co 0.2 Fe 0.8 O 3– δ possessed the highest hydrogen and carbon nanomaterials yields at 850 °C among all the investigated pre-catalysts. Especially, this pre-catalyst showed an excellent performance during the 10 cycles of successive deconstruction of plastic wastes with the highest hydrogen yield of 34.33 mmol / g plastic at the 7th cycle. More importantly, carbon nanotubes generated had higher graphitic characteristics and fewer defects. The presented results demonstrated that the developed perovskite-type pre-catalyst is a promising candidate for the production of hydrogen and carbon nanotube composites for energy storge applications from medical waste plastics. [Display omitted] • Co-production of H 2 and carbon nanotube composites over perovskite-type pre-catalysts. • Impact of reaction temperature and Co/Fe ratio in pre-catalysts on yields. • 10 successive cycle thermal pyrolysis of plastic medical wastes has been proceeded. • La 0.6 Ca 0.4 Co 1– x Fe x O 3− δ pre-catalyst gave 34.33 mmol / g plastic of H 2 at 7th cycle. [ABSTRACT FROM AUTHOR]

These authors contributed equally: Seung Hee Choi, Seok Bin Kwon and Jung Hyeon Yoo. Correction to: I Scientific Reports i https://doi.org/10.1038/s41598-023-27685-2, published online 17 March 2023 In the original version of this article Seung Hee Choi, Bo Young Kim and Young Hyun Song were incorrectly affiliated with 'Mobility Lighting Research Center, Korea Photonics Technology Institute, Gwangju, 61007, Republic of Korea'. [Extracted from the article]

Abstract: Materials with enhanced wear resistance are of great interest for modern industry. The different ways of producing superhard ceramic materials are shortly reviewed. In detail, the preparation of diamond–silicon carbide composites by reactive infiltration of diamond preforms with liquid silicon at ambient pressure is investigated. In addition to homogeneous SiC/diamond materials with nearly 50vol.% of diamond layered composites were also prepared. The microstructures of the materials prepared under different infiltration conditions were analyzed using X-ray diffraction, electron microscopy, electron back-scatter diffraction (EBSD) and Raman spectroscopy. The properties of the materials depend strongly on the formation of graphite interlayers at the boundary between SiC and diamond. Hardness of 47GPa was reached for materials where the formation of the interlayer was prevented. [Copyright &y& Elsevier]

The formation conditions of cubic spinel-structured gallium oxonitride have been investigated in situ under high-pressure/high-temperature conditions using a laser-heated diamond anvil cell. As starting materials, a mixture of the end members w-GaN/β-Ga2O3 in a molar ratio of 3:2 and a gallium oxonitride ceramic derived during pyrolysis from the metallo-organic precursor (Ga(OtBu)2NMe2)2 were used. In the mixture of the end members, spinel-structured gallium oxonitride starts crystallizing at a pressure of 3 GPa and at a temperature of about 1300 °C. The precursor-derived ceramic with predefined bondings reacted completely to the spinel phase, without by-products, at a pressure of 0.7 GPa. For the spinel-structured gallium oxonitride we determined a bulk modulus K of 216(7) GPa using a fixed value of 4 for K'. The spinel-structured gallium oxonitride exhibits a cell volume of 552.9(5) Å3 at ambient pressure. [ABSTRACT FROM AUTHOR]