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Heat Capacity of the R2Ge2O7 (R = Pr–Lu, Y) Rare-Earth Germanates

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Abstract—

The R2Ge2O7 (R = Pr–Lu, Y) rare-earth germanates have been prepared by solid-state reactions by firing stoichiometric R2O3 + GeO2 mixtures in air at temperatures in the range 1273–1473 K. The unit-cell parameters (a, c, and V) of the R2Ge2O7 (R = Tb–Lu) compounds have been shown to be linear functions of the ionic radius of the rare-earth elements. The high-temperature heat capacity of polycrystalline samples of the germanates has been determined by differential scanning calorimetry in the temperature range 350–1000 K. The variation in the specific heat of R2Ge2O7 has been shown to be correlated with the dependence of the heat capacity of rare-earth oxides on the ionic radius of the rare-earth element within each tetrad.

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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, N. V. Belousova, L. A. Irtyugo, V. M. Denisov & V. V. Beletskii

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

    Yu. F. Kargin

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  1. L. T. Denisova
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Correspondence to L. T. Denisova.

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Denisova, L.T., Kargin, Y.F., Belousova, N.V. et al. Heat Capacity of the R2Ge2O7 (R = Pr–Lu, Y) Rare-Earth Germanates. Inorg Mater 55, 952–958 (2019). https://doi.org/10.1134/S0020168519090024

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