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Journal of Materials Science

, Volume 30, Issue 20, pp 5263–5271 | Cite as

Mechanism of Si3N4 nucleation during carbothermal reduction of silica

  • M. V. Vlasova
  • T. S. Bartnitskaya
  • L. L. Sukhikh
  • L. A. Krushinskaya
  • T. V. Tomila
  • S. Yu. Artyuch
Article

Abstract

The process of carbothermal reduction of SiO2 in a nitrogen flow at temperatures of 1673–1723 K was investigated. It was established that mixtures obtained by the sol-gel technique are not microhomogeneous and consist of silica and carbon aggregates, inside which the processes of structure and phase ordering occur during heat treatment. The contact region of these aggregates is the place where SiO2 reduction occurs. In this region the following transformation takes place: partial SiO2 reduction, appearance of a film of melt of the composition SiOx, where x<2, enveloping of the carbon particles by this melt, destruction-activation of the carbon particles, implantation of nitrogen in the highly oxygen-defective melt, formation of silicon oxynitride and, subsequently, silicon nitride. α-Si3N4 forms in the presence of a large carbon nucleus, β-Si3N4 forms in its absence (or on two-dimensional particles).

Keywords

Polymer Silicon SiO2 Heat Treatment Nitride 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • M. V. Vlasova
    • 1
  • T. S. Bartnitskaya
    • 1
  • L. L. Sukhikh
    • 1
  • L. A. Krushinskaya
    • 1
  • T. V. Tomila
    • 1
  • S. Yu. Artyuch
    • 1
  1. 1.Institute for Material Science ProblemsNational Academy of Sciences of UkraineKievUkraine

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