Calorimetric Study of Natural Anapaite |
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| Authors: | L P Ogorodova L V Melchakova M F Vigasina D A Ksenofontov I A Bryzgalov |
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| Institution: | 1.Geological Faculty,Moscow State University,Moscow,Russia |
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| Abstract: | The thermochemical study of natural hydrous calcium and iron phosphate, anapaite Ca2Fe(PO4)2 · 4H2O (Kerch iron ore deposit, Crimea, Russia), was carried out using high-temperature melt solution calorimetry with a Tian-Kalvet microcalorimeter. The enthalpy of formation of the mineral from elements was obtained to be Δ f Hel°(298.15 K) =–4812 ± 16 kJ/mol. The values of the standard entropy and the Gibbs energy of anapaite formation are S°(298.15 K) = 404.2 J/K mol and Δ f Gel°(298.15 K) =–4352 ± 16 kJ/mol, respectively. |
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