Thermodynamic reassessment of the BaO-B2O3 system

The BaO-B2O3 pseudobinary system is assessed. A two-sublattice ionic solution model, (Ba2+) P (O2−, BO 3 3− , B4O 7 2− , B3O4.5) Q , is adopted to describe the liquid phase. All the solid phases are treated as stoichiometric compounds. A set of parameters consistent with most of the available experimental data on both phase diagram and thermodynamic properties is obtained by using CALPHAD technique. A comparison between the calculated results and experimental data as well as a previous assessment is presented.