Thermodynamic assessment of the BaO-TiO2 quasibinary system

Experimental data from the literature on the BaO-TiO2 quasibinary system ha ve been evaluated to assess the thermodynamic parameters of all the stable phases by means of the CALPHAD (CALculation of PHAse Diagram) method. The t wo-sublattice ionic solution model was used to describe the liquid phase, w hile the compound energy model was applied to describe the high-temperature forms of BaTiO3. Other compounds were treated as stoichiometric phases. Th e assessment was conducted using the Thermo-calc software package and a set of parameters was given. Calculated equilibrium phase diagrams and thermoc hemical properties compared with the experimental data are presented. There is a good agreement between the calculations and the experimental data. So me contradictions are pointed out and discussed.