Key phase diagram experiments and thermodynamic modeling of the ZnO‒B2O3, ZnO‒SiO2, and ZnO‒B2O3‒SiO2 systems

Abstract

Thermodynamic modeling of binary ZnO‒B₂O₃ and ZnO‒SiO₂ systems and ternary ZnO‒B₂O₃‒SiO₂ system were carried out based on the critical evaluation and optimization of all available phase diagram and thermodynamic property data using the CALculation of PHAse Diagram (CALPHAD) method. To resolve the inconsistency among the available phase diagram data in ternary ZnO‒B₂O₃‒SiO₂ system, key phase diagram experiment was carried out using classical quenching method followed by electron probe micro-analysis and X-ray diffraction phase determination. The liquid oxide solution was described using the modified quasichemical model accounting for a short-range ordering behavior in molten oxide solution. Thermodynamic models with optimized model parameters were used to predict the phase diagram and thermodynamic properties of the ternary systems.