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Nitrogenation Conditions for Mixed Silicon and Aluminum Alkoxide Xerogels

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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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Funding

This work was supported by the Russian Foundation for Basic Research, project No. 20-03-00455а.

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Correspondence to S. N. Ivicheva.

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The authors declare that they have no conflicts of interest.

ADDITIONAL INFORMATION

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

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