前言 对碱金属、碱土金属卤化物二元体系的电导、密度研究已有报导。关于稀土熔盐的研究,文献对单一稀土卤化物、或它与碱金属、或与碱土金属所构成的二元系 Preface The reports on the conductance and density of binary systems of alkali metals and alkaline earth halides have been reported. On the study of rare earth molten salt, the literature on a single rare earth halide, or it with alkali metal, or with alkaline earth metal binary system