Synthesis and thermochemistry of 2CaO•B2O3-H2O

被引：12
|
作者：
Liu, ZH [1 ]
Zuo, CF [1 ]
Li, SY [1 ]
机构：
[1] Shaanxi Normal Univ, Sch Chem & Mat Sci, Xian 710062, Peoples R China
来源：
THERMOCHIMICA ACTA | 2004年 / 424卷 / 1-2期
关键词：
2CaO-B2O3 center dot H2O; synthesis; standard molar enthalpy of formation;
D O I：
10.1016/j.tca.2004.05.029
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A pure calcium borate 2CaO(.)B(2)O(3)(.)H(2)O 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 2CaO.(B2O3H2O)-H-. in HCI-54.579H20 was determined. From a combination of this result with measured enthalpies of solution of H3BO3 in HCI(.)54(.)561H(2)O and of CaO in HCl+H3BO3 solution, together with the standard molar enthalpies of formation of CaO(s), H3BO3(s), and H2O(1), the standard molar enthalpy of formation of -(3041.8 +/- 2.5) kJ mol(-1) of 2CaO(.)B(2)O(3)(.)H(2)O was obtained. (C) 2004 Elsevier B.V. All rights reserved.
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页码：59 / 62
页数：4
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