Synthesis and thermochemistry of MgO•3B2O3•3.5H2O

被引：17
|
作者：
Liu, ZH [1 ]
Hu, MC [1 ]
机构：
[1] Shaanxi Normal Univ, Sch Chem & Mat Sci, Xian 710062, Shaanxi, Peoples R China
来源：
THERMOCHIMICA ACTA | 2003年 / 403卷 / 02期
关键词：
MgO center dot 3B(2)O(3)center dot 3.5H(2)O; synthesis; standard molar enthalpy of formation; solution calorimetry;
D O I：
10.1016/S0040-6031(03)00058-3
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A new magnesium borate MgO.3B(2)O(3).3.5H(2)O has been synthesized by the method of phase transformation of double salt and characterized by XRD, IR and Raman spectroscopy as well as by TG. The structural formula of this compound was Mg[B6O9(OH)(2)].2.5H(2)O. The enthalpy of solution of MgO.3B(2)O(3).3.5H(2)O in approximately 1 mol dm(-3) HCl was determined. With the incorporation of the standard molar enthalpies of formation of MgO(s), H3BO3(s), and H2O(1), the standard molar enthalpy of formation of -(5595.02 +/- 4.85) kJmol(-1) of MgO.3B(2)O(3)3.5H(2)O was obtained. Thermodynamic properties of this compound was also calculated by group contribution method. (C) 2003 Elsevier Science B.V. All rights reserved.
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页码：181 / 184
页数：4
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