Thermodynamics of calcium uranosilicate |
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| Authors: | N G Chernorukov A V Knyazev M S Sheiman S S Ponomarev T A Gur’eva |
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| Affiliation: | (1) Lobachevsky Nizhni Novgorod State University, Nizhni Novgorod, Russia |
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| Abstract: | The standard enthalpy of formation at 298.15 K of crystalline α-Ca(HSiUO6)2 · 5H2O (?6781.0 ± 9.5 kJ mol?1) was determined by reaction calorimetry. The heat capacity in the range of 80–300 K was measured by adiabatic vacuum calorimetry, and the thermodynamic functions of this compound were evaluated. The standard entropy of formation (?1978.6±1.2 J mol?1 K?1) and the Gibbs free energy of formation (6191.0±10.0 kJ mol?1) at 298.15 K were calculated. The standard thermodynamic functions of reactions of calcium uranosilicate synthesis were analyzed. |
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