Thermodynamic calculation of the GdCl3–ACl (A=Na,K,Rb,Cs) phase diagrams based on experimental data

Abstract An optimization of the binary GdCl 3 –ACl (A=Na,K,Rb,Cs) systems has been carried out using the CALPHAD technique. The new modified quasi-chemical model in the pair-approximation for short-range ordering was used to describe the Gibbs energies of the liquid phase in these systems. Based on the measured phase equilibrium data and experimental thermochemical properties, the GdCl 3 –ACl phase diagrams were optimized and calculated. A set of thermodynamic functions has been optimized based on an interactive computer-assisted analysis. The calculations based on the obtained descriptions show good agreement with experimental phase diagrams and thermodynamic values.