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

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