Standard molar enthalpies of formation of hydroxy-, chlor-, and bromapatite

被引：27
作者：
Cruz, FJAL
da Piedade, ME
Calado, JCG
机构：
[1] Inst Super Tecn, Ctr Quim Estrutural, P-1049001 Lisbon, Portugal
[2] Univ Lisbon, Fac Ciencias, Dept Quim & Bioquim, P-1749016 Lisbon, Portugal
来源：
JOURNAL OF CHEMICAL THERMODYNAMICS | 2005年 / 37卷 / 10期
关键词：
apatites; hydroxyapatite; chlorapatite; bromapatite; enthalpy of formation; thermochemistry;
D O I：
10.1016/j.jct.2005.01.010
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The standard (p degrees = 0.1 MPa) molar enthalpies of formation in the crystalline state of hydroxyapatite, chlorapatite and a preliminary value for bromapatite, at T = 298.15 K, were determined by reaction-solution calorimetry as: Delta(f)H(m)degrees[Ca-10(PO4)(6)Br-2, cr] = (OH)(2), cr] = -(13399 +/- 11) kJ(.)mol(-1), Delta(f)H(m)degrees[Ca-10(PO4)(6)Cl-2, cr] = -(13231 +/- 82) kJ(.)mol(-1), and Delta(f)H(m)degrees[Ca-10(PO4)(6)Br-2, cr] = -(13063 +/- 81) kJ(.)mol(-1). A critical assessment of these results and of previously published data is made. Finally, the standard molar enthalpy of formation of iodapatite is estimated as Delta(f)H(m)degrees[Ca-10(PO4)(6)I-2, cr] = -12949 kJ(.)mol(-1), from a linear correlation of Delta(f)H(m)degrees[Ca-10(PO4)(6)X-2, cr] (X = OH, F, Cl, Br) against the corresponding Delta(f)H(m)degrees[CaX2, cr]. (c) 2005 Elsevier Ltd. All rights reserved.
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页码：1061 / 1070
页数：10
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