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Synthesis, Crystal Structure, and High-Temperature Heat Capacity of Pb10 – xSmx(GeO4)2 + x(VO4)4 – x (x = 0.2, 0.5, 0.7, 1.0) Apatites from 350 to 1000 K

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Abstract

Pb10 – xSmx(GeO4)2 + x(VO4)4 – x (x = 0.2, 0.5, 0.7, 1.0) compounds with the apatite structure have been synthesized by firing appropriate mixtures of the PbO, Sm2O3, GeO2, and V2O5 oxides in air at temperatures from 773 to 1073 K. Their crystal structure has been studied using X-ray diffraction, and their high-temperature heat capacity (350–1000 K) has been determined by differential scanning calorimetry. The data have been used to evaluate their thermodynamic properties.

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ACKNOWLEDGMENTS

We are grateful to the Krasnoyarsk Regional Shared Research Facilities Center, Krasnoyarsk Scientific Center (Federal Research Center), Siberian Branch, Russian Academy of Sciences.

Funding

This work was supported in part by the Russian Federation Ministry of Science and Higher Education as part of the state research target for the Siberian Federal University federal state autonomous educational institution of higher education, project no. FSRZ-2020-0013.

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Authors and Affiliations

  1. Siberian Federal University, 660041, Krasnoyarsk, Russia

    L. T. Denisova, M. S. Molokeev, E. O. Golubeva, N. V. Belousova & V. M. Denisov

  2. Kirensky Institute of Physics, Krasnoyarsk Scientific Center (Federal Research Center), Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

    M. S. Molokeev

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

    Yu. F. Kargin

Authors
  1. L. T. Denisova
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  2. M. S. Molokeev
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  3. Yu. F. Kargin
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  4. E. O. Golubeva
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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., Molokeev, M.S., Kargin, Y.F. et al. Synthesis, Crystal Structure, and High-Temperature Heat Capacity of Pb10 – xSmx(GeO4)2 + x(VO4)4 – x (x = 0.2, 0.5, 0.7, 1.0) Apatites from 350 to 1000 K. Inorg Mater 58, 831–837 (2022). https://doi.org/10.1134/S0020168522070081

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