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Synthesis and High-Temperature Heat Capacity of the YbInGe2O7 and LuInGe2O7 Germanates in the Range 350—1000 K

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Abstract—

The YbInGe2O7 and LuInGe2O7 germanates have been prepared by solid-state reactions using stoichiometric oxide mixtures, which were sequentially fired at temperatures from 1273 to 1473 K in air, and their molar heat capacity has been determined by differential scanning calorimetry in the range 350‒1000 K. The experimental Cp(T) data obtained have been used to evaluate the enthalpy increment, entropy change, and reduced Gibbs energy of the rare-earth oxide compounds.

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Funding

This work was supported by the Russian Federation Ministry of Science and Higher Education (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. A. Irtyugo, V. V. Beletskii, N. V. Belousova & V. M. Denisov

  2. 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. A. Irtyugo
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  3. Yu. F. Kargin
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  4. V. V. Beletskii
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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., Irtyugo, L.A., Kargin, Y.F. et al. Synthesis and High-Temperature Heat Capacity of the YbInGe2O7 and LuInGe2O7 Germanates in the Range 350—1000 K. Inorg Mater 56, 151–155 (2020). https://doi.org/10.1134/S0020168520020041

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  • DOI: https://doi.org/10.1134/S0020168520020041

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