Low-temperature heat capacity and thermodynamic functions of thulium and lutetium titanates and Schottky anomaly in Tm2Ti2O7
Bissengaliyeva M.R. Knyazev A.V. Bespyatov M.A. Gogol D.B. Taimassova S.T. Zhakupov R.M. Sadyrbekov D.T.
February 2022Academic Press
Journal of Chemical Thermodynamics
2022#165
The temperature dependence of the heat capacity of Tm2Ti2O7 and Lu2Ti2O7 compounds over the range of 4.5–320 K has been researched by adiabatic calorimetry. Based on the experimental data, the basic thermodynamic functions of the compounds over the range of 5–320 K have been determined. Tm2Ti2O7 sample has revealed an additional component in the heat capacity associated with the presence of the Schottky anomaly. The temperature dependence behavior of the Debye characteristic temperature of Lu2Ti2O7 sample indicates the absence of anomalies in the heat capacity. Standard thermodynamic functions at 298.15 K are: for Tm2Ti2O7 – Cp,298.15 = 221.0 ± 1.2 J·mol−1·K−1, S298.15 = 261.3 ± 2.4 J·mol−1·K−1, ΔH0298.15 = 39.45 ± 0.29 kJ·mol−1; for Lu2Ti2O7 – Cp,298.15 = 206.9 ± 1.1 J·mol−1·K−1, S298.15 = 229.8 ± 2.2 J·mol−1·K−1, ΔH0298.15 = 35.70 ± 0.26 kJ·mol−1.
Adiabatic calorimetry , Heat capacity , Rare earth titanates , Schottky anomaly , Thermodynamic properties , X-ray diffraction
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Institute of Problems of Complex Development of Mineral Resources, Karaganda, Kazakhstan
N.I. Lobachevsky State University of Nizhniy Novgorod, Nizhniy Novgorod, Russian Federation
Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russian Federation
Academician E.A. Buketov Karaganda University, Karaganda, Kazakhstan
Institute of Problems of Complex Development of Mineral Resources
N.I. Lobachevsky State University of Nizhniy Novgorod
Nikolaev Institute of Inorganic Chemistry
Academician E.A. Buketov Karaganda University
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