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The thermodynamic properties of natural margarite

  • Chemical Thermodynamics and Thermochemistry
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Abstract

Thermal, IR spectroscopic, and thermochemical studies of natural brittle mica, margarite Ca1.00Na0.10Mg0.02Al3.89Fe 3+0.01 Si2.03Ti0.01O10(OH)1.74F0.26, were performed. The enthalpy of formation of natural margarite from the elements (−6269 ± 12 kJ/mol) was determined by melt solution calorimetry on a high-temperature heat-conducting Calvet microcalorimeter (Setaram, France). Enthalpy growth over the temperature range 298.15–973 K was determined by the drop method. Equations for the temperature dependences of the enthalpy and heat capacity were obtained, H°(T)−H°(298.15 K), J/mol = 435.21T + 36.46 × 10−3 T 2 + 109.91 × 105/T − 169863 and C° p , J/(mol K) = 435.21 + 72.92 × 10−3 T − 109.91 × 105/T 2. The experimental data were used to estimate the thermodynamic properties of margarite of the theoretical composition, CaAl2[Al2Si2O10](OH)2.

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Authors and Affiliations

  1. Faculty of Geology, Moscow State University, Moscow, Russia

    L. P. Ogorodova, M. F. Vigasina & L. V. Mel’chakova

Authors
  1. L. P. Ogorodova
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  2. M. F. Vigasina
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  3. L. V. Mel’chakova
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Correspondence to L. P. Ogorodova.

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Ogorodova, L.P., Vigasina, M.F. & Mel’chakova, L.V. The thermodynamic properties of natural margarite. Russ. J. Phys. Chem. 83, 2204–2207 (2009). https://doi.org/10.1134/S0036024409130032

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  • DOI: https://doi.org/10.1134/S0036024409130032

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