High-Temperature Heat Capacity of Pb 10 –    x  Nd  x  (GeO 4 ) 2 +    x  (VO 4 ) 4 –    x   ( x  = 0–3) Apatites

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

doi:10.1134/S1063783419070060

High-Temperature Heat Capacity of Pb_10 – _xNd_x(GeO₄)_2 + _x(VO₄)_4 – _x (x = 0–3) Apatites

Authors: Denisova L.T.¹, Golubeva E.O.¹, Belousova N.V.¹, Denisov V.M.¹, Galiakhmetova N.A.¹
Affiliations:
1. Institute of Non-Ferrous Metals and Material Science, Siberian Federal University
Issue: Vol 61, No 7 (2019)
Pages: 1343-1346
Section: Thermal Properties
URL: https://journal-vniispk.ru/1063-7834/article/view/205975
DOI: https://doi.org/10.1134/S1063783419070060
ID: 205975

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Abstract

We obtained Pb_10 – _xNd_x(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 C_p = f(T).