Abstract
For the purpose of determining the thermodynamic stability of γ-aluminum oxynitride spinel, alon, equilibrium gas compositions coexisting with alon--graphite have been measured by means of gas chromatography and quadrupole mass spectrometry in the temperature range from 1908 to 2023 K. From the results obtained, the standard Gibbs energy change of the carbothermal nitridation reaction of to form alon has been determined to be (±0.7) (1908-2023 K) where alon is expressed as is vacancy). Using the obtained Gibbs energy change, the eutectoid decomposition temperature of alon into and AlN has been evaluated to be and the chemical potential diagram of the Al-O-N-C system has been constructed at 2000 K. © 2003 The Electrochemical Society. All rights reserved.
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