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Thermodynamics of Lithium Uranoniobate and Its Monohydrate

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Abstract

Standard enthalpies of formation for crystalline LiNbUO6 (-2619.5±1.5 KJ/mol) and LiNbUO6· 2H2O (-3251.0±3.0 KJ/mol) at 298.15 K were determined by reaction calorimetry. The heat capacity of these compounds was studied in the range 80-300 K by adiabatic vacuum calorimetry, and their thermodynamic functions were calculated. Standard entropies (-528.5±4.1 and -976.7±4.1 J mol- 1 K- 1) and Gibbs functions of formation at 298.15 K (-2462.0±2.5 and -2960.0±4.0 kJ/mol) for LiNbUO6 and LiNbUO6·2H2O, respectively, were calculated. Thermodynamic functions for a number of reactions yielding these compounds were calculated and examined.

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Authors and Affiliations

  1. Lobachevskii Nizhny Novgorod State University, Nizhny Novgorod, Russia

    N. V. Karyakin, N. G. Chernorukov, E. V. Suleimanov, V. L. Trostin, A. V. Makarov & O. V. Feoktistova

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  1. N. V. Karyakin
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  2. N. G. Chernorukov
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  3. E. V. Suleimanov
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  4. V. L. Trostin
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  5. A. V. Makarov
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  6. O. V. Feoktistova
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Karyakin, N.V., Chernorukov, N.G., Suleimanov, E.V. et al. Thermodynamics of Lithium Uranoniobate and Its Monohydrate. Russian Journal of General Chemistry 71, 1518–1521 (2001). https://doi.org/10.1023/A:1013970013093

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