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Synthesis, crystal structure and high-temperature heat capacity of substituted apatites Pb9R(GeO4)3(VO4)3 (R=Tb, Dy, Ho)
Russian version
DOI: 10.21883/PSS.2022.11.54182.353
Denisova L. T.1, Molokeev M. S.1,2, Golubeva E. O.1, Belousova N. V.1, Denisjv V. M.1
1Siberian State University, Krasnoyarsk, Russia
2Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Email: ldenisova@sfu-kras.ru
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Pb9R(GeO4)3(VO4)3 (R=Tb, Dy, Ho) apatites were obtained by solid-phase synthesis from the initial oxides of PbO, Tb2O3 (Dy2O3, Ho2O3), GeO2 and V2O5 by sequential annealing (at a temperature of 773-1073 K) in an air atmosphere. Their crystal structure has been determined by X-ray diffraction analysis. The high-temperature heat capacity was measured by differential scanning calorimetry. Based on the experimental dependence of the heat capacity on the temperature, the thermodynamic properties are calculated. Keywords: apatites, solid-phase synthesis, crystal structure, heat capacity, thermodynamic properties. Keywords: apatites, solid-phase synthesis, crystal structure, heat capacity, thermodynamic properties.
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