Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (11): 1249-1253.doi: 10.3866/PKU.WHXB20051111

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Phase Equilibrium of the NdCl3-CdCl2-HCl-H2O System at 298.15 K and Characterization of New Compounds

QIAO Zhan-ping; ZHUO Li-hong; GUO Ying-chen; WANG Hui   

  1. Chemistry Department, Nanyang Normal University, Nanyang 473061; Key Laboratory for Physical and Inorganic Chemistry of Shaanxi Province, Department of Chemistry, Northwest University, Xi’an 710069
  • Received:2005-04-27 Revised:2005-06-06 Published:2005-11-15
  • Contact: QIAO Zhan-ping

Abstract: The equilibrium solubility of the quaternary system NdCl3-CdCl2-HCl-H2O was determined at 298.15 K and the corresponding equilibrium diagram was constructed. The result shows that the quaternary system was complicated with four equilibrium solid phases CdCl2•H2O, 9CdCl2•NdCl3•20H2O (9:1 type), 5CdCl2•NdCl3•13H2O (5:1 type) and NdCl3•6H2O. The two new compounds, 9CdCl2•NdCl3•20H2O and 5CdCl2•NdCl3•13H2O, have not yet been reported in literatures, and they were congruently soluble in the quaternary. The two new compounds have been prepared from the system and characterized by XRD, TG-DTG, and fluorescence (FL) spectra. Result of FL spectra showed that the 9CdCl2•NdCl3•20H2O has weak fluorescence intensity, and 5CdCl2•NdCl3•13H2O exhibited larger fluorescence intensity than 9CdCl2•NdCl3•20H2O. X-ray powder diffraction patterns were indexed.

Key words: Quaternary system, Phase equilibrium, Cadmium chloride, Neodymium trichloride, Fluorescence spectra