摘要: In this paper the phase diagrams of LaCl₃-LiCl and CeCl₃-LiCl systems have been experimentally determined and theoretically calculated. Bath are simple eutectic systems. The eutectic points are at 25mol% LaCl₃, 508℃ and 27mol% CeCl₃, 494℃, respectively. The optimized phase diagrams and thermodynamical data of LaCl₃-LiCl and CeCl₃-LiCl systems with self consistency are a better basis for constructing ternary phase diagrams.