Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (02): 128-133.doi: 10.3866/PKU.WHXB20050204

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

ZHUO Li -Hong; QIAO Zhan-Ping; GUO Ying-Chen; WANG Hui   

  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:2004-06-30 Revised:2004-08-24 Published:2005-02-15
  • Contact: WANG Hui E-mail:huiwang@nwu.edu.cn

Abstract: 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.

Key words: Ternary system, Quaternary system, Phase equilibrium, Cadmium chloride, Cerium chloride