CeCl3-CdCl2-H2O和CeCl3-CdCl2-HCl-H2O的相平衡

测定了三元系CeCl₃-CdCl₂-H₂O (25 ℃)和四元系CeCl₃-CdCl₂-HCl(～8.4％)-H₂O(25 ℃) 的相平衡溶度数据,绘制了相应的溶度图.该三元系是由5个固相区CdCl₂&;#8226;2.5H₂O(原始盐)、CdCl₂&;#8226;H₂O(原始盐)、6CdCl₂&;#8226;CeCl₃&;#8226;14H₂O、4CdCl₂&;#8226;CeCl₃&;#8226;12H₂O、CeCl₃&;#8226;7H₂O(原始盐)组成的复杂体系.该四元系是由5个固相区CdCl₂&;#8226;H₂O(原始盐)、9CdCl₂&;#8226;CeCl₃&;#8226;19H₂O、6CdCl₂&;#8226;CeCl₃&;#8226;14H₂O、4CdCl₂&;#8226;CeCl₃&;#8226;12H₂O、CeCl₃&;#8226;7H₂O(原始盐)组成的复杂体系.其中6CdCl₂&;#8226;CeCl₃&;#8226;14H₂O在该三元系是介稳化合物.9CdCl₂&;#8226;CeCl₃&;#8226;19H₂O 、6CdCl₂&;#8226;CeCl₃&;#8226;14H₂O和4CdCl₂&;#8226;CeCl₃&;#8226;12H₂O用X射线粉末衍射及TG-DTG和DSC等方法进行了研究,并对X射线粉末衍射进行了指标化.

Phase Equilibrium of the CeCl3-CdCl2-H2O and CeCl3-CdCl2-HCl-H2O Systems

The solubilities of the ternary CeCl₃-CdCl₂-H₂O system and the quaternary CeCl₃-CdCl₂-HCl-H₂O system were determined at 25 ℃,and the corresponding equilibrium diagrams were constructed. The results show that the ternary system was complicated with five equilibrim solid phases, and they are CdCl₂•2.5H₂O,CdCl₂•H₂O, 6CdCl₂•CeCl₃•14H₂O (6:1 type), 4CdCl₂•CeCl₃•12H₂O(4:1 type) and CeCl₃•7H₂O.The quaternary system was also complicated with five equilibrium solid phases, that is, CdCl₂•H₂O, 9CdCl₂•CeCl₃•19H₂O (9:1 type), 6CdCl₂•CeCl₃•14H₂O (6:1 type), 4CdCl₂•CeCl₃•12H₂O (4:1 type) and CeCl₃•7H₂O.Three new compounds, 9CdCl₂•CeCl₃•19H₂O, 6CdCl₂•CeCl₃•14H₂O,and 4CdCl₂•CeCl₃•12H₂O have not yet been reported in literatures, and they were congruently soluble in the quaternary.6CdCl₂•CeCl₃•14H₂O was a kind of metastable compound in the ternary system, and it was changed into 4CdCl₂•CeCl₃•12H₂O with time. Both 6:1 type and 4:1 type were non-congruently soluble compounds in the ternary system. The three new compounds have been prepared and have been characterized by XRD, TC-DTG, and DSC. X-ray powder diffraction patterns are indicated.