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Fizika Tverdogo Tela, 2020 Volume 62, Issue 11, Pages 1828–1833 (Mi ftt8249)

Semiconductors

Synthesis, structure, and thermophysical properties of Pb$_{10-x}$Bi$_{x}$(GeO$_{4}$)$_{2+x}$(VO$_{4}$)$_{4-x}$ ($x$ = 0 – 3) in the temperature range of 350–950 K

L. T. Denisovaa, M. S. Molokeevbc, V. M. Denisova, E. O. Golubevaa, N. A. Galiakhmetovaa

a Siberian Federal University, Institute of Metallurgy and Materials Science, Krasnoyarsk, 660041, Russia
b Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk
c L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk

Abstract: The Pb$_{10-x}$Bi$_{x}$(GeO$_{4}$)$_{2+x}$(VO$_{4}$)$_{4-x}$ ($x$ = 0–3) compounds with an apatite structure have been obtained for the first time from the initial PbO, Bi$_{2}$O$_{3}$, GeO$_{2}$ and V$_{2}$O$_{5}$ oxides by the solid-state synthesis in the temperature range of 773–1073 K. The structure of the compounds has been determined by X-ray diffraction analysis. The effect of temperature on specific heat of the synthesized compounds has been investigated by differential scanning calorimetry. The thermodynamic properties of the compounds have been calculated from the experimental $C_p=f(T)$ data.

Keywords: bismuth-doped lead vanadate germanates, apatites, structure, high-temperature specific heat, thermodynamic properties.

Received: 04.07.2020
Revised: 04.07.2020
Accepted: 08.07.2020

DOI: 10.21883/FTT.2020.11.50056.141


 English version:
Physics of the Solid State, 2020, 2:11, 2045–2051

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