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High-Temperature Heat Capacity of Pb10 – xNdx(GeO4)2 + x(VO4)4 – x (x = 0–3) Apatites

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Abstract

We obtained Pb10 – xNdx(GeO4)2 + x(VO4)4 – x (x = 0–3) compounds with an apatite structure by solid-phase synthesis from initial oxides PbO, Nd2O3, GeO2, and V2O5 with successive annealing at 773–1073 K in the air. Their high-temperature heat capacity was measured by differential scanning calorimetry. The thermodynamic functions (changes in enthalpy, entropy, and reduced Gibbs energy) are calculated using the experimental dependences of Cp = f(T).

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Funding

The work was supported in the framework of the State task of the Ministry of Science and Higher E-ducation of the Russian Federation to the Siberian Federal University for 2017–2019, project no. 4.8083.2017/8.9 “Formation of a Database of Thermodynamic Characteristics of Complex Oxide Multifunctional Materials Containing Rare and Dispersed Elements.”

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Authors and Affiliations

  1. Institute of Non-Ferrous Metals and Material Science, Siberian Federal University, 660025, Krasnoyarsk, Russia

    L. T. Denisova, E. O. Golubeva, N. V. Belousova, V. M. Denisov & N. A. Galiakhmetova

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  1. L. T. Denisova
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  2. E. O. Golubeva
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  3. N. V. Belousova
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  4. V. M. Denisov
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  5. N. A. Galiakhmetova
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Correspondence to L. T. Denisova.

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The authors declare that they have no conflict of interest.

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Translated by O. Zhukova

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Denisova, L.T., Golubeva, E.O., Belousova, N.V. et al. High-Temperature Heat Capacity of Pb10 – xNdx(GeO4)2 + x(VO4)4 – x (x = 0–3) Apatites. Phys. Solid State 61, 1343–1346 (2019). https://doi.org/10.1134/S1063783419070060

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