本文用差热分析法重新测定了组成PrCl_3-NaCl-LiCl三元系的三个侧边二元系相图,测定了该三元系中6个不同组成的变温截面,从而构筑了PrCl_3-NaCl-LiCl三元相图。该三元系由分别对应于PrCl_3,NaCl,2NaCl·LiCl,NaCl·LiCl和LiCl的5个液相面,7条二次结晶线,两个转熔点和一个共晶点构成。转熔点和共晶点的温度和组成分别为:P_1(416℃,30.3mol％NaCl,44.2mol％LiCl,25.5mol％PrCl_3);P_2(409℃,25.0mol％NaCl,50.0mol％LiCl,25.0mol％PrCl_3);E(404℃,20.0mol％NaCl,55.4mol％LiCl,24.6mol％PrCl_3)。二元和三元相图液相限的测量误差约为±5℃和±7℃。
Ternary phase diagram of the PrCl_3-NaCl-LiCl system has been deter-mined by means of DTA technique. It is found that this ternary system is com-posed of five liquidus surfaces, seven second crystaline lines, two peritectic pointsand one eutectic point.
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