Synthesis, crystal structure and thermodynamic properties of apatite Pb3Bi2(GeO_4)3
Denisova L. T.1, Molokeev M. S.1,2, Golubeva E. O.1, Belousova. N. V.1, Denisov 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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Apatite Pb3Bi2(GeO_4)3 was obtained by the solid-phase method from the initial oxides of PbO, Bi2O3 and GeO2 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.
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