Thermodynamic modeling of the isomorphous phase diagrams in the Al2O3-Cr2O3 and V2O3-Cr2O3 systems

Abstract

The phase diagrams in the Al2O3Cr2O3 and V2O3-Cr2O3 systems have been assessed by thermodynamic modeling with existing data from the literature. While the regular and subregular solution models were used in the Al2O3-Cr2O3 system to represent the Gibbs free energies of the liquid and solid phases, respectively, the regular solution model was applied to both phases in the V2O3-Cr2O3 system. By using the liquidus, solidus, and/or miscibility gap data, the interaction parameters of the liquid and solid phases were optimized through a multiple linear regression method. The phase diagrams calculated from these models are in good agreement with experimental data. Also, the solid miscibility gap and chemical spinodal in the V2O3-Cr2O3 system were estimated.