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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References
Ginderow, D., Acta Crystallogr., Sect. C, 1988, vol. 44, pp. 421–424.
Nguyen Son, N. and Silva, R.J., J. Chem. Thermodyn., 1992, vol. 24, pp. 359–376.
Chernorukov, N.G., Nipruk, O.V., Knyazev, A.V., and Strakhova, E.Yu., Radiokhimiya, 2005, vol. 47, no. 4, pp. 328–333.
Skuratov, S.M., Kolesov, E.P., and Vorob’ev, A.F., Termokhimiya (Thermochemistry), Moscow: Mosk. Gos. Univ., 1966, part 1, pp. 184–197.
Malyshev, V.M., Mil’ner, G.A., Sorkin, E.L., and Shibakin, V.F., Prib. Tekh. Eksp., 1985, vol. 6, p. 195.
Rybkin, N.G., Orlova, M.P., Baranyuk, A.K., et al., Izmer. Tekh., 1974, no. 7, p. 29.
Karyakin, N.V., Chernorukov, G.N., and Bondareva, A.S., Zh. Fiz. Khim., 2002, vol. 76, no. 12, pp. 2328–2331.
Termicheskie konstanty veshchestv (Thermal Constants of Substances), Glushko, V.P., Ed., Moscow: Akad. Nauk SSSR, 1981, issue X, part 2.
Termicheskie konstanty veshchestv (Thermal Constants of Substances), Glushko, V.P., Ed., Moscow: Akad. Nauk SSSR, 1979, issue IX.
Kodata Key Values, J. Chem. Thermodyn., 1975, vol. 7, no. 1, pp. 1–3.
Chernorukova, A.S., Cand. Sci. (Chem.) Dissertation, Nizhni Novgorod State Univ., 2003.
Chernorukov, N.G., Knyazev, A.V., and Sergacheva, I.V., Zh. Neorg. Khim., 2005, vol. 50, no. 1, pp. 5–15.
Kelley, K.K., Parks, G.S., and Huffman, H.M., J. Phys. Chem., 1929, vol. 33, no. 12, pp. 1802–1807.
Parks, G.S. and Huffman, H.M., The Free Energies of Some Organic Compounds, New York: Chem. Catalog, 1932.
Termicheskie konstanty veshchestv (Thermal Constants of Compounds), Glushko, V.P., Ed., Moscow: Nauka, 1971, issue IV, part 2, p. 431.
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Original Russian Text © N.G. Chernorukov, A.V. Knyazev, M.S. Sheiman, S.S. Ponomarev, T.A. Gur’eva, 2006, published in Radiokhimiya, 2006, Vol. 48, No. 3, pp. 217–219.