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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℃。
In this paper, the thermogravimetric analysis was used to re-determine the three side binary system phase compositions of PrCl_3-NaCl-LiCl ternary system. The temperature transition cross sections of six different compositions in the ternary system were determined. PrCl_3-NaCl -LiCl ternary phase diagram. The ternary system consists of five liquid phases corresponding to PrCl_3, NaCl, 2NaCl.LiCl, NaCl.LiCl and LiCl, seven secondary crystallization lines, two transition points and one eutectic point. The temperature and composition of the melting point and eutectic point were P 1 (416 ℃, 30.3mol% NaCl, 44.2mol% LiCl, 25.5mol% PrCl_3), P_2 (409 ℃, 25.0mol% NaCl, 50.0mol% LiCl, 25.0 mol% PrCl 3; E (404 ° C, 20.0 mol% NaCl, 55.4 mol% LiCl, 24.6 mol% PrCl 3). The measurement error of the binary phase and ternary phase liquid phase limits is about ± 5 ° C and ± 7 ° C.