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SrB4O7·3.5H2O的合成、表征与热化学研究
Synthesis,characterization and thermochemistry of SrB4O7·3.5H2O
【摘要】 合成了一种新型碱土金属硼酸盐SrB4O7.3.5H2O,并对它进行了化学分析、红外光谱(IR)、X射线衍射(XRD)及热分析(TG-DTA)等一系列物相鉴定与表征。通过设计热力学循环,利用微热量计测定了SrB4O7.3.5H2O溶解于约1 mol.L-1HC l水溶液中的摩尔溶解焓,再结合H3BO3在HC l(aq)的摩尔溶解焓,Sr(OH)2.8H2O(s)溶解于[HC l(aq)+H3BO3(aq)]的摩尔溶解焓,以及H2O(l)、Sr(OH)2.8H2O(s)与H3BO3(s)的标准摩尔生成焓,得到了SrB4O7.3.5H2O的标准摩尔生成焓为?(4435.15±3.30)kJ.mo?l 1。
【Abstract】 One pure alkaline-earth metal borates,SrB4O7·3.5H2O has been prepared and identified by X-ray diffraction,infrared spectral and thermal analysis and chemical analysis.The molar enthalpies of solution of SrB4O7·3.5H2O in 1 mol·dm–3 HCl(aq)was measured.With the incorporation of the previously determined enthalpy of solution of Sr(OH)2·8H2O(s)in [HCl(aq)+H3BO3(aq)],H3BO3 in HCl(aq)and the standard molar enthalpies of formation of H2O(l),Sr(OH)2·8H2O(s)and H3BO3(s),the standard molar enthalpies of formation of SrB4O7·3.5H2O was found to be –(4435.15± 3.30)kJ·mol–1.
【Key words】 borate； microcalorimetry； thermochemistry； standard molar enthalpy of formation；
- 【文献出处】 化学研究与应用 ,Chemical Research and Application , 编辑部邮箱 ,2009年03期
- 【分类号】O641.4
- 【被引频次】1
- 【下载频次】95