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A Thermodynamic Assessment of the Cr - Fe - O System

The thermodynamic properties and phase relationships in the Cr-Fe-O system have been critically assessed. The solid oxide phases have been represented using the «compound energy» model, which allows the introduction of non-stoichiometry, lattice vacancies, interstitial ions and exchange of ions between different sublattices in a formally very simple way. The properties of both dilute solutions of oxygen in Cr-Fe liquid alloys and liquid oxides were represented by a single two-sublattice «ionic liquid» model. The modelling is limited by the experimental data available but aims to cover the temperature range 298 K to about 2600 K