Refined heat capacity of LaPO4 in the temperature range 0–1600 K |
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Authors: | K.S. Gavrichev M.A. Ryumin A.V. Tyurin V.M. Gurevich L.N. Komissarova |
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Affiliation: | aNizhny Novgorod State University, Gagarin Prospekt 23/2, 603950 Nizhny Novgorod, Russia |
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Abstract: | In the present work temperature dependence of heat capacity of cesium tantalum tungsten oxide has been measured first in the range from 7 to 350 K and then between 330 and 630 K, respectively, by precision adiabatic vacuum and dynamic calorimetry. The experimental data were used to calculate standard thermodynamic functions, namely the heat capacity Cp° (T), enthalpy H°(T) − H°(0), entropy S°(T) − S°(0) and Gibbs function G°(T) − H°(0), for the range from T → 0 to 630 K. The structure of CsTaWO6 is refined by the Rietveld method: space group F d3m, Z = 8, a = 10.3793(2) Å, V = 1118.14(4) Å3. The high-temperature X-ray diffraction was used for the determination of temperature of phase transition and coefficient of thermal expansion. |
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Keywords: | Cesium tantalum tungsten oxide Adiabatic vacuum calorimetry Heat capacity Thermodynamic functions X-ray diffraction |
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