【摘要】 利用DTA和X射线衍射技术研究了SmCl₃-PbCl₂二元系和SmCl₃-PbCl₂-CaCl₂三元系相图。发现SmCl₃-PbCl₂系有一个异份熔化化合物3SmCl₃ PbCl₂,体系转熔点p为465℃,42.0mol-%SmCl₃,低共熔点e是452℃,33.0mol-%SmCl₃,SmCl₃-PbCl₂-CaCl₂三元系有对应SmCl₃,PbCl₂,CaCl₂,和3SmCl₃·PbCl₂四个液相面,五条二次结晶线,一个三元低共熔点E[396℃,29.5mol-%SmCl₃,58.0mol-%PbCl₂],一个三元转熔点P[417℃,36.0mol-%SmCl₃,50.0mol-%PbCl₂),对应的两个四相平衡反应为: L=PbCl₂+CaCl₂+3SmCl₃·PbCl₂ L+SmCl₃=3SmCl₃·PbCl₂+CaCl₂更多还原

【Abstract】 Phase diagrams of binary system SmCl₃-PbCl₂ and ternary systemSmCl₃-PbCl₂-CaC₂, have been determined by DTA and X-ray diffraction analyses. In theSmCl₃-PbCl₂ system, an incongruent compound 3SmCl₃-PbCl₂, an eutectic point at 452℃containing 33.0 mol-% SmCl₃ and a peritectic point at 465℃ containing 42.0 mol-%SmCl₃ were obtained. In the SmCl₃-PbCl₂-CaCl₂ system, 4 liquiduses corresponding to theprimary crystallization of SmCl₃, PbCl₂, CaCl₂, and 3SmCl₃·PbCl₂, respectively, 5unvariant lines related to the secondary crystallization, a ternary eutectic point at 396℃ con-taining 29.5 SmCl₃ and 58.0 PbCl₂ by mol-% and a ternary peritectic point at 417℃ con-taining 36.0 SmCl₃ and 50.0 PbCl₂ by mol-% were found. Two reactions corresponding to 4phase equilibriums are L=CaCl₂+PbCl₂+3SmCl₃·PbCl₂ and L+SmCl₃=CaCl₂+3SmCl₃·PbCl₂.更多还原