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Heat Capacity and Thermal Expansion of Yttrium Tantalate

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Abstract

The isobaric heat capacities of two monoclinic (M' and M) modifications of yttrium orthotantalate at temperatures 5–1300 K have been measured by the adiabatic and differential scanning calorimetry methods. It has been demonstrated that the difference in structure between the crystal lattices of M' and M has little effect in the heat capacity, and the difference between the heat capacities of these phases Cp(M) – Cp(M') is small, always positive, and increases in the range of the lowest temperatures. The unit cell parameters of M-YTaO4 have been determined as a function of temperature in the range 300–1173 K.

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ACKNOWLEDGMENTS

This work was supported by the Russian Science Foundation (project no. 18–13–00025) and performed with the use of equipment of the Shared Facility Center, Institute of General and Inorganic Chemistry, RAS.

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Authors and Affiliations

  1. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    A. V. Khoroshilov, A. A. Ashmarin, V. N. Guskov, K. S. Gavrichev &  V. M. Novotortsev

  2. “Technological Systems of Protective Coatings” Limited Liability Company, 142172, Moscow, Russia

    E. G. Sazonov

Authors
  1. A. V. Khoroshilov
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  2. A. A. Ashmarin
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  3. V. N. Guskov
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  4. E. G. Sazonov
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  5. K. S. Gavrichev
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  6. V. M. Novotortsev
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Corresponding author

Correspondence to V. N. Guskov.

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Translated by G. Kirakosyan

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Khoroshilov, A.V., Ashmarin, A.A., Guskov, V.N. et al. Heat Capacity and Thermal Expansion of Yttrium Tantalate. Dokl Phys Chem 484, 12–14 (2019). https://doi.org/10.1134/S0012501619010032

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  • DOI: https://doi.org/10.1134/S0012501619010032

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