Thermal properties

Synthesis, crystal structure and thermodynamic properties of apatite Pb$_3$Bi$_2$(GeO$_4$)$_3$

L. T. Denisova^a, M. S. Molokeev^ab, E. O. Golubeva^a, N. V. Belousova^a, V. M. Denisov<sup>a

a</sup> Siberian Federal University, Krasnoyarsk, Russia
^b L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russia

Abstract: Apatite Pb$_3$Bi$_2$(GeO$_4$)$_3$ was obtained by the solid-phase method from the initial oxides of PbO, Bi$_2$O$_3$ and GeO$_2$ by sequential firing in air at temperatures of 773–1003 K. Its crystal structure has been refined by X-ray diffraction. The high-temperature heat capacity (350–1000 K) of this compound was measured by differential scanning calorimetry. Based on these data, the main thermodynamic functions are calculated. Keywords: apatite bismuth-lead germanate, solid-phase synthesis, high-temperature heat capacity, thermodynamic properties.

Keywords: apatite bismuth-lead germanate, solid-phase synthesis, high-temperature heat capacity, thermodynamic properties.

Received: 13.03.2022
Revised: 13.03.2022
Accepted: 15.03.2022

DOI: 10.21883/FTT.2022.07.52579.312

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