Abstract
The apatite-like Pb9Pr(GeO4)3(VO4)3 and Pb9Sm(GeO4)3(VO4)3 compounds were prepared by solid-phase synthesis using oxides as starting chemicals: PbO, Pr2O3 (Sm2O3), GeO2, and V2O5. The successive annealing was carried out at 773–1073 K in the air. The effect of rare-earth elements on the structure of the Pb9R(GeO4)3(VO4)3 (R = La, Pr, Nd, Sm) apatites and basic thermodynamic functions was investigated. The temperature dependence (350–1050 K) of the heat capacity of the Pr(Sm)-containing apatites has been determined by differential scanning calorimetry. It has been established that the Cp = f(T) curve for the Pb9Pr(GeO4)3(VO4)3 compound has an extremum associated with a polymorphic transformation in the region of 978 K.
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Funding
The work is performed as a part of the state assignment for the science of Siberian Federal University, project no. FSRZ-2020-0013.
Use of equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” is acknowledged.
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Denisova, L.T., Golubeva, E.O., Denisov, V.M. et al. High-Temperature Heat Capacity of Pb9R(GeO4)3(VO4)3 (R = La, Pr, Nd, Sm) Apatites. Russ. J. Phys. Chem. 94, 2669–2673 (2020). https://doi.org/10.1134/S0036024420130099
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DOI: https://doi.org/10.1134/S0036024420130099