Phase equilibria in the AgCl-LnCl3 (Ln=Ce, Nd, Sm, Gd) binary systems

Differential thermal analysis and differential scanning calorimetry were used to investigate phase equilibria in the AgCl-LnCl(3) (Ln=Ce, Sm, Gd) binary systems. It was found that systems under investigation represent typical examples of simple eutectic systems. The eutectic compositions and eutectic temperatures were found to be: x(CeCl3)=0.095, T-eut=700 K (for AgCl-CeCl3), x(SmCl3)=0.228, T-eut=644 K (for AgCl-SmCl3) and x(GdCl3)=0.288, T-eut=609 K (for AgCl-GdCl3). The thermodynamic functions of mixing in AgCl-LnCl(3) systems (Ln=Ce, Nd, Sm, Gd) were predicted on the basis of experimental data using the CALPHAD method by association model (AM) and Redlich-Kister model (RKM). The possibility of existence of the associates in the liquid phase was discussed.