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Heat Capacity of Pb10 –xPrx(GeO4)2 +x(VO4)4– x (x = 0, 1, 2, 3) Apatites in the Range 350–1050 K

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Abstract

Pb10 – xPrx(GeO4)2 + x(VO4)4 – x (x = 0, 1, 2, 3) apatites have been prepared by solid-state reactions via sequential firing of appropriate oxide mixtures (PbO, Pr2O3, GeO2, and V2O5) in air in the temperature range 773–1073 K. Their unit-cell parameters have been determined as functions of temperature by high-temperature X-ray diffraction measurements, and the linear and volume expansion coefficients of Pb7Pr3(GeO4)5(VO4) have been calculated. The heat capacity of the synthesized Pb10 – xPrx(GeO4)2 + x(VO4)4 – x (x = 0, 1, 2, 3) compounds with the apatite structure has been determined by differential scanning calorimetry in the temperature range 350–1050 K. The cp(T) curves of the samples with x = 1, 2, and 3 have been shown to have extrema (in particular, peaks at 701, 917, and 1018 K for the x = 3 sample) due to phase transitions. The experimental Cp(T) heat capacity data have been used to evaluate the thermodynamic functions of the synthesized apatites.

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Authors and Affiliations

  1. Institute of Nonferrous Metals and Materials Science, Siberian Federal University, 660041, Krasnoyarsk, Russia

    L. T. Denisova, E. O. Golubeva & V. M. Denisov

  2. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, 119334, Moscow, Russia

    Yu. F. Kargin

  3. Polytechnic Institute, Siberian Federal University, 660041, Krasnoyarsk, Russia

    G. M. Zeer & A. K. Abkaryan

Authors
  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. G. M. Zeer
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  5. A. K. Abkaryan
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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., Kargin, Y.F., Golubeva, E.O. et al. Heat Capacity of Pb10 –xPrx(GeO4)2 +x(VO4)4– x (x = 0, 1, 2, 3) Apatites in the Range 350–1050 K. Inorg Mater 56, 1027–1032 (2020). https://doi.org/10.1134/S0020168520100039

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