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• W2093854844 abstract "An extensive theoretical study is performed for wide bandgap crystalline oxides and nitrides, namely, SiO_{2}, GeO_{2}, Al_{2}O_{3}, Si_{3}N_{4}, and Ge_{3}N_{4}. Their important polymorphs are considered which are for SiO_{2}: $alpha$-quartz, $alpha$- and $beta$-cristobalite and stishovite, for GeO_{2}: $alpha$-quartz, and rutile, for Al_{2}O_{3}: $alpha$-phase, for Si_{3}N_{4} and Ge_{3}N_{4}: $alpha$- and $beta$-phases. This work constitutes a comprehensive account of both electronic structure and the elastic properties of these important insulating oxides and nitrides obtained with high accuracy based on density functional theory within the local density approximation. Two different norm-conserving textit{ab initio} pseudopotentials have been tested which agree in all respects with the only exception arising for the elastic properties of rutile GeO_{2}. The agreement with experimental values, when available, are seen to be highly satisfactory. The uniformity and the well convergence of this approach enables an unbiased assessment of important physical parameters within each material and among different insulating oxide and nitrides. The computed static electric susceptibilities are observed to display a strong correlation with their mass densities. There is a marked discrepancy between the considered oxides and nitrides with the latter having sudden increase of density of states away from the respective band edges. This is expected to give rise to excessive carrier scattering which can practically preclude bulk impact ionization process in Si_{3}N_{4} and Ge_{3}N_{4}." @default.
• W2093854844 created "2016-06-24" @default.
• W2093854844 creator A5005966345 @default.
• W2093854844 creator A5041209480 @default.
• W2093854844 date "2007-08-01" @default.
• W2093854844 modified "2023-10-16" @default.
• W2093854844 title "Theoretical study of the insulating oxides and nitrides: SiO2, GeO2, Al2O3, Si3N4, and Ge3N4" @default.
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• W2093854844 doi "https://doi.org/10.1007/s10853-007-1526-9" @default.
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