Hydrothermal synthesis, characterization and thermochemistry of Ca₂[B₂O₄(OH)₂]·0.5H₂O

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• 作者：Liu Zhihong ; Zuo Chuanfeng and Hu Mancheng
• 关键词：Ca₂[ ; B₂O₄(OH)₂] ; · ; 0.5H₂O ; Synthesis ; Standard molar enthalpy of formation
• 刊名：Thermochimica Acta
• 出版年：2005
• 出版时间：2005
• 年：2005
• 卷：435
• 期：2
• 页码：168-171
• 全文大小：165 K

文摘

A pure calcium borate Ca₂[B₂O₄(OH)₂]·0.5H₂O has been synthesized under hydrothermal condition and characterized by XRD, FT-IR and TG as well as by chemical analysis. The molar enthalpy of solution of Ca₂[B₂O₄(OH)₂]·0.5H₂O in HC1·54.582H₂O was determined. From a combination of this result with measured enthalpies of solution of H₃BO₃ in HC1·54.561H₂O and of CaO in (HCl + H₃BO₃) solution, together with the standard molar enthalpies of formation of CaO(s), H₃BO₃(s) and H₂O(l), the standard molar enthalpy of formation of −(3172.5 ± 2.5) kJ mol⁻¹ of Ca₂[B₂O₄(OH)₂]·0.5H₂O was obtained.