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, image image 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.
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