Abstract
The conditions for β-SiAlON to be prepared by reacting highly dispersed mixed silicon and aluminum alkoxide xerogels with molecular nitrogen at 1600–1700°С are determined. The nitrogenation of mixed xerogels is shown to be due to the catalytic pyrolytic decomposition of hydrolysis products of silicon and aluminum alkoxides in a nitrogen atmosphere, namely, a mixture of alcohols that are adsorbed or chemisorbed on aluminosilicate xerogel particles. The pyrolysis of alcohols in a nitrogen atmosphere catalyzed by highly dispersed alumina yields hydrogen and carbon monoxide, which activate nitrogenation and affect the phase composition of the samples and change the sialon stoichiometry from β-Si3Al3O3N5 to the 15R polytype.
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This work was supported by the Russian Foundation for Basic Research, project No. 20-03-00455а.
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The article is published following the results of the Sixth Interdisciplinary Scientific Forum with International Participation “New Materials and Advanced Technologies”, Moscow, November 23–26, 2020. https://n-materials.ru.
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Translated by O. Fedorova
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Ivicheva, S.N., Klimashin, A.A., Ovsyannikov, N.A. et al. Nitrogenation Conditions for Mixed Silicon and Aluminum Alkoxide Xerogels. Russ. J. Inorg. Chem. 66, 1183–1190 (2021). https://doi.org/10.1134/S003602362108009X
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DOI: https://doi.org/10.1134/S003602362108009X