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Heat Capacity of the Gd2Ti2O7 and Lu2Ti2O7 Pyrochlores in the Range 350–1000 K

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Abstract—

The Gd2Ti2O7 and Lu2Ti2O7 titanates (pyrochlore structure, sp. gr. Fd3m) have been prepared by solid-state reactions in air at temperatures from 1673 to 1773 K using the Gd2O3, Lu2O3, and TiO2 oxides as starting materials. Their high-temperature heat capacity has been determined by differential scanning calorimetry in the range 350–1000 K. The experimental heat capacity data have been used to evaluate the thermodynamic functions of gadolinium and lutetium dititanates.

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ACKNOWLEDGMENTS

This work was supported by the Russian Federation Ministry of Education and Science (state research target for Siberian Federal University in 2017–2019, project no. 4.8083.2017/8.9: Establishing a Database of Thermodynamic Characteristics of Multifunctional Mixed-Oxide Materials Containing Rare and Trace Elements).

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Authors and Affiliations

  1. Institute of Nonferrous Metals and Materials Science, Siberian Federal University, Svobodnyi pr. 79, 660041, Krasnoyarsk, Russia

    L. T. Denisova, L. G. Chumilina, N. V. Belousova & V. M. Denisov

  2. Institute of Metallurgy, Ural Branch, Russian Academy of Sciences, ul. Amundsena 101, 620016, Yekaterinburg, Russia

    V. V. Ryabov

  3. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskii pr. 49, 119991, Moscow, Russia

    Yu. F. Kargin

Authors
  1. L. T. Denisova
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  2. L. G. Chumilina
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  3. V. V. Ryabov
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  4. Yu. F. Kargin
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  5. N. V. Belousova
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  6. V. M. Denisov
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Correspondence to L. T. Denisova.

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Translated by O. Tsarev

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Denisova, L.T., Chumilina, L.G., Ryabov, V.V. et al. Heat Capacity of the Gd2Ti2O7 and Lu2Ti2O7 Pyrochlores in the Range 350–1000 K. Inorg Mater 55, 477–481 (2019). https://doi.org/10.1134/S0020168519050029

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  • DOI: https://doi.org/10.1134/S0020168519050029

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