Abstract
The previously proposed order parameter functional method is considered for application to phase equilibria in ordering nonstoichiometric interstitial compounds MX y . Equations are derived for calculating the ranges of temperature and composition where a disordered phase and ordered phases exist. The ordering was taken into account for the first time to calculate the phase diagrams of the Zr-C, Hf-C, Nb-C and Ta-C systems, and the possible types of nonstoichiometric ordered carbide phases were determined. It is shown that superstructures of the M 4X 3 and M 8X 7 type cannot be formed in nonstoichiometric MX y compounds.
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