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A low-temperature heat capacity study of natural lithium micas

Heat capacity of zinnwaldite

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Abstract

Low-temperature heat capacity of natural zinnwaldite was measured at temperatures from 6 to 303 K in a vacuum adiabatic calorimeter. An anomalous behavior of heat capacity function C p(T) has been revealed at very low temperatures, where this function does not tend to zero. Thermodynamic functions of zinnwaldite have been calculated from the experimental data. At 298.15 K, heat capacity C p(T) = 339.8 J K−1mol−1, calorimetric entropy S o(Т) – S o(6.08) = 329.1 J K−1 mol−1, and enthalpy Н o(Т) − Н o(6.08) = 54,000 J mol−1. Heat capacity and thermodynamic functions at 298.15 K for zinnwaldite having theoretical composition were estimated using additive method of calculation.

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Acknowledgements

This work was supported by Russian Fund of Fundamental Investigations of Russian Academy of Sciences (Grant No. 06-05-64305) and the Integration Interdisciplinary Project No. 81 of the Siberian Division, Russian Academy of Sciences. The authors thank S. Purusova, analyst of the chemical laboratory of N.M. Fedorovsky Russian Institute of Mineral Materials, for the chemical analysis of the studied sample of zinnwaldite.

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Authors and Affiliations

  1. Institute of Inorganic Chemistry SB RAS, pr. Ac. Lavrentieva 3, 630090, Novosibirsk, Russia

    I. E. Paukov & Yulia A. Kovalevskaya

  2. Geological Department, M.V. Lomonosov Moscow State University, Leninskie Gory, 119991, Moscow, Russia

    Irina A. Kiseleva

  3. All-Russian Institute of Mineral Resources, 31, Staromonetny per, 119017, Moscow, Russia

    Tatiana N. Shuriga

Authors
  1. I. E. Paukov
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  2. Yulia A. Kovalevskaya
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  3. Irina A. Kiseleva
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  4. Tatiana N. Shuriga
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Correspondence to I. E. Paukov.

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Paukov, I.E., Kovalevskaya, Y.A., Kiseleva, I.A. et al. A low-temperature heat capacity study of natural lithium micas. J Therm Anal Calorim 99, 709–712 (2010). https://doi.org/10.1007/s10973-009-0210-5

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  • DOI: https://doi.org/10.1007/s10973-009-0210-5

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