高等学校化学学报Issue(9)：1759-1764,6.DOI:10.7503/cjcu20150187
CsBr-TmBr3-H2 O和CsBr-TmBr3-HBr（~13%）-H2 O（298.15 K）的相平衡及新固相化合物的热力学和荧光性质
Equilibria for the CsBr-TmBr3-H2O and CsBr-TmBr3-HBr(~13%)-H2O Systems at 298. 15 K and Thermodynamic and Fluorescent Properties of New Solid-phase Compound
摘要
Abstract
The phase equilibria of the ternary system CsBr-TmBr3-H2 O and the quaternary system CsBr-TmBr3-HBr( ~13%)-H2 O at 298. 15 K were investigated by the isothermal solubility method. Based on the experimental data, the corresponding phase diagrams were plotted. In the ternary system, three crystallization regions corresponding to CsBr, Cs3 Tm2 Br9 ·16H2 O and TmBr3 ·8H2 O were found. Similarly, there were three crystallization regions corresponding to CsBr, Cs3 Tm2 Br9 ·16H2 O and TmBr3 ·8H2 O in the quaternary system. The phase diagrams of the ternary and quaternary systems were compared and a new double salt Cs3 Tm2 Br9 ·16H2 O is formed which is incongruently soluble in the two systems;the area of the crystallization region of Cs3Tm2Br9 ·16H2O increases with the increasing concentration of HBr in the equilibrium liquid phase. The new solid-phase compound Cs3 Tm2 Br9 ·16H2 O was characterized by chemical analysis, X-ray diffraction( XRD) and thermal gravity-differential thermal gravity( TG-DTG) techniques. The fluorescence ex-citation and emission spectra of Cs3 Tm2 Br9 ·16H2 O were measured. Upconversion emission of the new solid phase was found at 471 nm when excited at 712 nm. The standard molar enthalpy of solution of Cs3 Tm2 Br9 · 16H2 O in water was measured to be -( 11. 63 ± 0. 46 ) kJ/mol by microcalorimetry under the condition of infinite dilution and its standard molar enthalpy of formation was determined as -(7826. 2±1. 2) kJ/mol.关键词
相平衡/溴化铯/溴化铥/标准摩尔生成焓/荧光性质Key words
Phase diagram/Cesium bromide/Thulium bromide/Standard molar enthalpy of formation/Fluorescent property分类
化学化工引用本文复制引用
李赵婉,乔占平,陈欣,党元林,杨奇超..CsBr-TmBr3-H2 O和CsBr-TmBr3-HBr（~13%）-H2 O（298.15 K）的相平衡及新固相化合物的热力学和荧光性质[J].高等学校化学学报,2015,(9):1759-1764,6.基金项目
国家自然科学基金(批准号:21173123)资助 （批准号:21173123）
