Abstract
The heat capacity of gadolinium orthophosphate (GdPO4) measured in the temperature range 11.15–344.11 K by adiabatic calorimetry and available literature data were used to calculate its thermodynamic functions at 0–1600 K. At 298.15 K, these functions are as follows: C 0 p (298.15 K) = 101.85 ± 0.05 J K−1 mol−1, S 0(298.15 K) = 123.82 ± 0.18 J K−1 mol−1, H 0(298.15 K)–H 0(0) = 17.250 ± 0.012 kJ mol−1, and Φ 0(298.15 K) = 65.97 ± 0.18 J K−1 mol−1 The calculated Gibbs free energy of formation from the elements of GdPO4 is Δ f G 0 (298.15 K) = −1844.3 ± 4.7 kJ mol−1.
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Original Russian Text © V.M. Gurevich, M.A. Ryumin, A.V. Tyurin, L.N. Komissarova, 2012, published in Geokhimiya, 2012, Vol. 50, No. 8, pp. 784–793.
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Gurevich, V.M., Ryumin, M.A., Tyurin, A.V. et al. Heat capacity and thermodynamic properties of GdPO4 in the temperature range 0–1600 K. Geochem. Int. 50, 702–710 (2012). https://doi.org/10.1134/S0016702912060031
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DOI: https://doi.org/10.1134/S0016702912060031