Thermodynamic calculation of the Li2O-BaO-B2O3 pseudo-ternary phase diagram

Employing the CALPHAD technique, the phase diagram of the Li2O-BaO-B2O3 system has been thermodynamically calculated based on well-defined Li2O-B2O3 and BaO-B2O3 binary systems, as well as available information on the ternary system. By means of the optimization of BaB2O4-Li2B2O4 and BaB2O4-Li2O vertical sections, the interaction parameters of liquid in the Li2O-BaO systems are estimated and the phase diagram is thus presented. Meanwhile, the Gibbs energies of the ternary compounds, LiBaB9O15; LiBa2B5O10 and Li6Ba2B4O11, have been approximately evaluated. The liquidus projection of the phase diagram has been calculated and the primary field of each phase, especially beta-BaB2O4 has been pre dieted. The liquid immiscibility in the vicinity of B2O3 is also calculated.