Abstract
The heat capacity of polycrystalline dysprosium orthoniobate was studied over a wide temperature range by three calorimetric methods: relaxation calorimetry (2–50 K), adiabatic calorimetry (9–350 K), and differential scanning calorimetry (308–1300 K). Below 9 K a descending low-temperature anomaly branch was detected, whose peak is beyond the measurement limits. At 1086 K a reversible phase transition occurs. The behavior of heat capacity and \(C_{p}^{^\circ }(T)\) in the phase-transition region implies that this is a second-order phase transition. The data gained were used to calculate temperature-dependent standard thermodynamic functions of DyNbO4 over the whole measurement range.
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ACKNOWLEDGMENTS
The equipment of the Shared Facilities Center of the Kurnakov Institute was used in the frame of the Governmental assignment to the Kurnakov Institute in the field of fundamental research.
Funding
This study was supported by the Russian Foundation for Basic Research (project no. 18-03-00343).
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Translated by O. Fedorova
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Nikiforova, G.E., Tyurin, A.V., Ryumin, M.A. et al. Heat Capacity and Thermodynamic Functions of Dysprosium Orthoniobate in the Range 2–1300 K. Russ. J. Inorg. Chem. 65, 688–694 (2020). https://doi.org/10.1134/S0036023620050186
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DOI: https://doi.org/10.1134/S0036023620050186