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Citation: ZHUO Li -Hong, QIAO Zhan-Ping, GUO Ying-Chen, WANG Hui. Phase Equilibrium of the CeCl₃-CdCl₂-H₂O and CeCl₃-CdCl₂-HCl-H₂O Systems[J]. Acta Physico-Chimica Sinica, ;2005, 21(02): 128-133. doi: 10.3866/PKU.WHXB20050204 shu

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

1.
Department of Chemistry ,Nanyang Teacher’s College, Nanyang　473061;　Key Laboratory for Physical and Inorganic Chemistry of Shaanxi Province, Department of Chemistry, Northwest University, Xi’an　710069

Received Date: 30 June 2004
Available Online: 15 February 2005

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.
- Ternary system; Quaternary system; Phase equilibrium; Cadmium chloride; Cerium chloride
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Phase Equilibrium of the CeCl₃-CdCl₂-H₂O and CeCl₃-CdCl₂-HCl-H₂O Systems