ErCl_3-CdCl_2-HCl-H_2O的相平衡(25℃)及其固相化合物  

Phase Equilibrium of the ErCl_3-CdCl_2-HCl-H_2O System at 25 ℃ and Characterization of New Compounds

作　　者：卓立宏[1] 乔占平[1] 郭应臣[1] 王惠[2] 

机构地区：[1]南阳师范学院化学系,河南南阳473061 [2]西北大学化学系,西安710069

出　　处：《物理化学学报》2006年第5期616-621,共6页Acta Physico-Chimica Sinica

基　　金：河南省自然科学基金(0311021900)资助项目

摘　　要：测定了四元体系ErCl3-CdCl2-HCl-H2O(298.15K)的相平衡溶度数据,绘制了相应的溶度图.该四元体系是由4个固相区CdCl·2H2O(原始盐)、9CdCl·22ErCl3·29H2O、CdCl·27ErCl·342H2O、ErCl3·6H2O(原始盐)组成的复杂体系.对两个新物相化合物9CdCl2·2ErCl·329H2O和CdCl·27ErCl3·42H2O进行了XRD、TG-DTG和荧光光谱研究.结果表明,两个新物相化合物均具有荧光和上转换发光性能;化合物9CdCl2·2ErCl3·29H2O通过3步失去其结晶水,CdCl2·7ErCl·342H2O则1步失去其结晶水.The equilibrium solubility of the quaternary system ErCl3-CdCl2·HCl-H2O was determined at 25 ℃ and the corresponding equilibrium diagram was constructed. The quaternary system is complicated with four equilibrium solid phases CdCl2· H2O, 9CdCl2·2ErCl3·29H2O, CdCl2·7ErCl3-42H2O, and ErCl3· 6H2O. The two new compounds, 9CdCl2· 2ErCl3 ·29H2O and CdCl2·TErCl3 ·42H2O, have not yet been reported in literatures, and have been characterized by XRD, TG-DTG, and fluorescence spectra. Results showed that the two compounds have fluorescence and upconversion fluorescence, and their intensities increase with the ErCl3 ratio increasing in CdCl2· 9CdCl2 ·2ErCl3 · 29H2O loses its crystal water by three steps in the temperature range from 55 to 215 ℃, while CdCl2·7ErCl3 ·42H2O loses its crystal water by one step in the temperature range from 65 to 188 ℃.

关 键 词：四元体系 相平衡 氯化镉 氯化铒 上转换发光 

分 类 号：O642.42[理学—物理化学]