Heat capacity and thermodynamic functions of thulium orthophosphate TmPO 4  in the range of 10–1350 K

M. A. Ryumin; V. M. Gurevich; A. V. Khoroshilov; A. V. Tyurin; K. S. Gavrichev

doi:10.1134/S003602441711019X

Heat capacity and thermodynamic functions of thulium orthophosphate TmPO₄ in the range of 10–1350 K

Авторы: Ryumin M.A.¹, Gurevich V.M.², Khoroshilov A.V.¹, Tyurin A.V.¹, Gavrichev K.S.¹
Учреждения:
1. Kurnakov Institute of General and Inorganic Chemistry
2. Vernadsky Institute of Geochemistry and Analytical Chemistry
Выпуск: Том 91, № 12 (2017)
Страницы: 2310-2316
Раздел: Chemical Thermodynamics and Thermochemistry
URL: https://journals.rcsi.science/0036-0244/article/view/169790
DOI: https://doi.org/10.1134/S003602441711019X
ID: 169790

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The heat capacity of TmPO₄ in temperature ranges of 9.11–346.05 and 304.6–1344.6 K is measured via adiabatic and differential scanning calorimetry, respectively. The measurement data are used to calculate the temperature dependences of the heat capacity, entropy, change in enthalpy, and reduced Gibbs energy of TmPO₄ in the range of 10–1344 K. The Gibbs energy of formation of thulium orthophosphate from elements Δ_fG⁰(298.15 K) is determined.