Gibbs energy change of carbothermal nitridation reaction of γ-AlON and its thermodynamic stability

Wataru Nakao, Hiroyuki Fukuyama

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

In order to determine the standard Gibbs energy change of carbothermal nitridation reaction of γ-aluminum oxynitride spinel, γ-AlON, the equilibrium N2-CO gas compositions coexisting with γ-AlON, aluminum nitride (AlN), and graphite have been measured by means of gas chromatography at elevated temperatures. From the results obtained, the standard Gibbs energy change has been determined at temperatures ranging from 1912 to 2002 K,where γ-AlON is expressed as Al(64+x)3V(8-x)3O32-xNx (V: vacancy). Moreover, the thermodynamic stability in the homogeneous phase region of γ-AlON has been evaluated by a thermodynamic model of γ-AlON together with the experimental results.

Original languageEnglish
Pages (from-to)3170-3176
Number of pages7
JournalJournal of the American Ceramic Society
Volume88
Issue number11
DOIs
Publication statusPublished - 2005 Nov 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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