Low temperature measurements of the heat capacity and thermodynamic functions of pseudo-malachite Cu5(PO4)2(OH)4

被引：7

作者：

Bissengaliyeva, M. R. ^{[1
]}

Gogol, D. B. ^{[1
]}

Bekturganov, N. S. ^{[2
]}

机构：

[1] Inst Complex Dev Mineral Resources, Karaganda 100019, Kazakhstan

[2] SC Natl Sci Technol Holding Parasat, Astana 010000, Kazakhstan

来源：

THERMOCHIMICA ACTA | 2012年 / 532卷

关键词：

Adiabatic calorimetry; Pseudo-malachite; Thermodynamic functions;

D O I：

10.1016/j.tca.2010.11.035

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The investigation of the heat capacity of a natural specimen of copper phosphate pseudo-malachite Cus(PO4)(2)(OH)(4) in the temperature range between 4.2 K and 320 K has been carried out by the method of low-temperature adiabatic calorimetry. Tabulated values of the heat capacity and thermodynamic functions of the mineral including the changes of entropy and enthalpy and the Gibbs function of free energy have been calculated. The standard values of thermodynamic functions of pseudomalachite at T=298.15 K are C degrees(p.m) = (385.43 +/- 0.41)J mole(-1) K-1, Delta S-T(0)degrees(m) = (412.16 +/- 0.61)J mole(-1) K-1 Delta H-T(0)degrees(m)= (63681.5 +/- 57.0)J mole(-1), F degrees(m) = (198.57 +/- 0.47) J mole(-1) K-1. In the low-temperature area 0 < (T/K) < 22.69 an anomaly has been registered in the variation of the heat capacity of the mineral, for which the lattice constituent has been determined. The contribution of anomalous component into entropy and enthalpy of the mineral is Delta S-tr= (5.772 +/- 0.081) J mole(-1) K-1, Delta H-tr = (29.94 +/- 0.42) J mole(-1). (C) 2010 Elsevier B.V. All rights reserved.y

引用

页码：139 / 144

页数：6

共 5 条

[1]

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[2]

Bissengaliyeva M.R., 2004, ALL RUSS SCI S THERM, P92

[3]

Krestov G.A., 1961, J INORG CHEM, V6, P2294

[4]

Martens W, 2003, AM MINERAL, V88, P37

[5] THERMAL PROPERTIES OF TRANSITION METAL COMPOUNDS - HEAT CAPACITY, ENTROPY, ENTHALPY, FREE ENERGY AND HEAT OF FUSION OF TRIS(ACETYLACETONATO) COMPLEXES OF SCANDIUM(III), VANADIUM(III), MANGEANESE(III), IRON(III) AND COBALT(III) AND VAPOUR PRESSURE OF TRIS(ACETYLACETONATO) IRON(III) .4. [J].

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