Measurements of Free Energy of Formation of Aluminium Oxycarbide (Al₄O₄C)

Abstract

Free energy of formation of the intermediate oxycarbide Al₄O₄C of the system Al₂O₃-Al₄C₃ was obtained by measuring CO-pressure of the three phase field, Al₂O₃-Al₄O₄C-C, which is given as
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\ oindentat 1400∼1600°C.
Preparation of aluminium oxycarbide in a pure state was not successful because of volatilization of aluminium and aluminium suboxides during the reaction of alumina and carbon at high temperatures. The samples consisting of Al₂O₃, Al₄O₄C and C were then prepared by reacting either alumina and carbon or aluminium, alumina and carbon at 1900°C.