Thermodynamic Assessment of EuCl3–MgCl2 and EuCl3–BaCl2 Systems

Abstract

Using the CALPHAD technique, an assessment of the binary EuCl 3 -MgCl 2 and EuCl 3 -BaCl 2 systems has been carried out in this study. The modified quasi-chemical model was defined to describe the Gibbs energies of the liquid phases, and the model parameters were optimized from the experimental phase diagram data. The phase diagrams and enthalpies of mixing of the EuCl 3 -MgCl 2 and EuCl 3 -BaCl 2 systems were calculated. The calculated results by the present method agree well with the experimental data. The Gibbs energies of formation of Mg Cl 13 from the pure components were predicted.

Thermodynamic Optimization and Calculation of the LaCl₃-CaCl₂ System

“…From LaCl3-MgCl2 to LaCl3-CaCl2, the values of the mixing enthalpy become more negative. The behaviour of the LaCl3-MgCl2 and LaCl3-CaCl2 systems investigated in the present study is found to be similar to that of the analogous systems such as LnCl3-AECl2 (Ln = Pr [14], Nd [14], Eu [2], Gd [7,15], Yb [7,15]; AE = Mg, Ca, Sr, Ba). It appears that the enthalpies of mixing increase to more negative values from Mg to Ca which is expected from the increasing "relative ionic potential" as suggested by Hong and Kleppa [16].…”

“…This paper deals with the LaCl3-CaCl2 system using CALPHAD technology. It is a part of our wide and systematic research program on the lanthanide halide -alkali earth metal halide molten salts [1][2][3][4][5].…”