The thermodynamic characteristics of natural iron-lithium micas |
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Authors: | L P Ogorodova I A Kiseleva L V Mel’chakova T N Shuriga |
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Institution: | (1) Faculty of Geology, Moscow State University, Leninskie gory, Moscow, 119992, Russia;(2) Fedorovskii All-Russia Institute of Mineral Resources (VIMS), Staromonetnyi per. 29, Moscow, 109017, Russia |
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Abstract: | A thermochemical study of natural lithium micas, iron-containing polylithionite and lepidolite, was performed on a high-temperature heat-flux Calvet microcalorimeter (Setaram, France). Melt solution calorimetry was used to measure the enthalpies of mineral formation from the elements Δf H°el (298.15 K), ?5989.3 ± 9.6 and ?5981.3 ± 6.3 kJ/mol, respectively. The drop method was used to determine the enthalpy increments heating of the micas over the temperature interval 444–973 K. The equations for the temperature dependences of the heat capacities and enthalpies of Fe-polylithionite and Fe-lepidolite were obtained. The S° (298.15 K) and Δf G°el (298.15 K) values were estimated. The thermodynamic functions of the micas were calculated over the temperature range 298.15–1000 K. |
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