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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。
A new kind of alkaline earth metal borate SrB4O7.3.5H2O was synthesized and characterized by chemical analysis, IR spectroscopy, X-ray diffraction (XRD) and thermal analysis (TG-DTA) Characterization. The molar enthalpies of dissolution of SrB4O7.3.5H2O in about 1 mol·L-1HCl aqueous solution were determined by the design of thermodynamic cycle. The molar enthalpy of dissolution of SrB4O7.3.5H2O in aqueous solution of HCl (aq), Sr (OH) The molar enthalpy of solution of 2.8H2O (s) dissolved in [HC1 (aq) + H3BO3 (aq)] and the standard molar enthalpy of formation of H2O (1), Sr (OH) 2.8H2O (s) and H3BO3 (s) The standard molar enthalpy of formation of SrB4O7.3.5H2O was obtained as (4435.15 ± 3.30) kJ · mol-1 1.