Phase State Diagrams of a Four-Component System Al-Si-N-O - Analysis of the Thermodynamic Stability of Sialon Compounds Dased on Energy Crystal-Chemistry

Abstract:

The paper presents the results of the analysis of the state diagram of compounds in the system А1₂O₃-SiO₂. It has been found that the presence and the concentration of oxygen have a very important effect on formation of compounds with a crystalline structure in different syngony based on SIALON. Oxygen contributes to transition of the metastable Al_XSi_3-XN₄compound into stable one. The parameter of structural “friability” of compounds has been used in the analysis of thethermodynamic stability of compounds in the Al-Si-N-O system. It has been foundthat the SiAl₄O₂N₄ compound with the 12H-SIALON structure (Pearson symbol hP32) has the greatest thermodynamic stability among the compounds under study in this system.

• Periodical: Solid State Phenomena (Volume 303)
• Pages: 97-103
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.303.97
• Online since: May 2020
• Authors: V.A. Vlasov, Аnatoliy A. Klopotov*, V.I. Vereshchagin, O.G. Volokitin, K.A. Bezukhov, N.P. Gorlenko, N.A. Tsvetkov
• Keywords: Ceramics, Metastable Compounds, SIALON, State Diagram

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