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Heat Capacity of Pb10 –xLax(GeO4)2 +x(VO4)4 –x (x = 0, 1, 2, 3) Apatites in the Range 320–1000 K

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Abstract—

Pb10 –xLax(GeO4)2 +x(VO4)4 –x (x = 0, 1, 3) compounds with the apatite structure have been prepared by solid-state reactions via multistep firing of appropriate oxide mixtures in air in the temperature range 773–1073 K. The heat capacity of the synthesized polycrystalline samples has been determined by differential scanning calorimetry. The experimental Cp(T) data have been used to evaluate the thermodynamic properties of the lead lanthanum germanatovanadates: enthalpy increment, entropy change, and reduced Gibbs energy.

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ACKNOWLEDGMENTS

This work was supported in part 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, E. O. Golubeva, 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

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  1. L. T. Denisova
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  2. Yu. F. Kargin
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  3. E. O. Golubeva
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  4. N. V. Belousova
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  5. 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., Kargin, Y.F., Golubeva, E.O. et al. Heat Capacity of Pb10 –xLax(GeO4)2 +x(VO4)4 –x (x = 0, 1, 2, 3) Apatites in the Range 320–1000 K. Inorg Mater 55, 162–166 (2019). https://doi.org/10.1134/S002016851902002X

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  • DOI: https://doi.org/10.1134/S002016851902002X

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