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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >THERMOCHEMISTRY OF PHOSPHATE PRODUCTS .1. STANDARD ENTHALPY OF FORMATION OF TRISTRONTIUM PHOSPHATE AND STRONTIUM CHLORAPATITE
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THERMOCHEMISTRY OF PHOSPHATE PRODUCTS .1. STANDARD ENTHALPY OF FORMATION OF TRISTRONTIUM PHOSPHATE AND STRONTIUM CHLORAPATITE

机译:磷酸盐产品的热化学1。磷酸锶和氯代锶盐形成的标准焓

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Tristrontium phosphate Sr-3(PO4)(2) (triSr) and strontium chlorapatite Sr-3(PO4)(6)Cl-2 (ClapSr) have been prepared and characterized by X-ray diffraction, IR spectroscopy and chemical analysis. Using an isoperibol calorimeter the heat of solution of these products in a 9% weight nitric acid solution were determined. They are (-110.1 +/- 1.5) and (-283.6 +/- 2.4) kJ mol(-1) for triSr and ClapSr, respectively. Combining these results with others found by dissolving the products and entities involved in thermochemical cycles, allows to determine the standard heat of formation of these Sr-phosphates. These quantities are: Delta(f)H degrees(triSr, 298 K) = -4110 kJ mol(-1) and Delta(f)H degrees(ClapSr, 298 K) = -13233 kJ mol(-1). The results are discussed on the basis of the differences in bond enthalpies. (C) 1997 Elsevier Science B.V. [References: 15]
机译:制备了磷酸三锶Sr-3(PO4)(2)(triSr)和亚氯酸锶锶Sr-3(PO4)(6)Cl-2(ClapSr),并通过X射线衍射,红外光谱和化学分析对其进行了表征。使用异黄酮量热计测定这些产物在9%重量硝酸溶液中的溶液热。对于triSr和ClapSr,它们分别是(-110.1 +/- 1.5)和(-283.6 +/- 2.4)kJ mol(-1)。将这些结果与通过溶解参与热化学循环的产物和实体而获得的其他结果结合起来,可以确定这些Sr-磷酸盐形成的标准热量。这些数量是:Delta(f)H度(triSr,298 K)= -4110 kJ mol(-1)和Delta(f)H度(ClapSr,298 K)= -13233 kJ mol(-1)。根据键焓的差异讨论结果。 (C)1997 Elsevier Science B.V. [参考:15]

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