利用DTA和X射线衍射技术研究了SmCl_3-PbCl_2二元系和SmCl_3-PbCl_2-CaCl_2三元系相图。发现SmCl_3-PbCl_2系有一个异份熔化化合物3SmCl_3 PbCl_2,体系转熔点p为465℃,42.0mol-％SmCl_3,低共熔点e是452℃,33.0mol-％SmCl_3,SmCl_3-PbCl_2-CaCl_2三元系有对应SmCl_3,PbCl_2,CaCl_2,和3SmCl_3·PbCl_2四个液相面,五条二次结晶线,一个三元低共熔点E[396℃,29.5mol-％SmCl_3,58.0mol-％PbCl_2],一个三元转熔点P[417℃,36.0mol-％SmCl_3,50.0mol-％PbCl_2),对应的两个四相平衡反应为: L=PbCl_2+CaCl_2+3SmCl_3·PbCl_2 L+SmCl_3=3SmCl_3·PbCl_2+CaCl_2
Phase diagrams of binary system SmCl_3-PbCl_2 and ternary systemSmCl_3-PbCl_2-CaC_2, have been determined by DTA and X-ray diffraction analyses. In theSmCl_3-PbCl_2 system, an incongruent compound 3SmCl_3-PbCl_2, an eutectic point at 452℃containing 33.0 mol-% SmCl_3 and a peritectic point at 465℃ containing 42.0 mol-%SmCl_3 were obtained. In the SmCl_3-PbCl_2-CaCl_2 system, 4 liquiduses corresponding to theprimary crystallization of SmCl_3, PbCl_2, CaCl_2, and 3SmCl_3·PbCl_2, respectively, 5unvariant lines related to the secondary crystallization, a ternary eutectic point at 396℃ con-taining 29.5 SmCl_3 and 58.0 PbCl_2 by mol-% and a ternary peritectic point at 417℃ con-taining 36.0 SmCl_3 and 50.0 PbCl_2 by mol-% were found. Two reactions corresponding to 4phase equilibriums are L=CaCl_2+PbCl_2+3SmCl_3·PbCl_2 and L+SmCl_3=CaCl_2+3SmCl_3·PbCl_2.
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