Thermodynamic Optimization of the LaF_3-NaF System

The phase diagram of the LaF 3-NaF system is optimized by using the new modified quasichemical model in the pair-approximation for short-range ordering and calculated with CALPHAD (Calculation of Phase Diagram) technique. This model was used to describe the Gibbs energies of liquid phase in this system. A set of thermodynamic functions has been optimized based on an interactive computer-assisted analysis. The calculated phase diagram and optimized thermodynamic parameters are thermodynamically self-consistent.