Synthesis, Crystal Structure, and High-Temperature Heat Capacity of Pb10 –xSmx(GeO4)2 +x(VO4)4 –x (x = 0.2, 0.5, 0.7, 1.0) Apatites from 350 to 1000 K

Pb 10 – x Sm x (GeO 4 ) 2 + x (VO 4 ) 4 – x ( x = 0.2, 0.5, 0.7, 1.0) compounds with the apatite structure have been synthesized by firing appropriate mixtures of the PbO, Sm 2 O 3 , GeO 2 , and V 2 O 5 oxides in air at temperatures from 773 to 1073 K. Their crystal structure has been studied using...

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Bibliographic Details
Published in:Inorganic materials 2022-08, Vol.58 (8), p.831-837
Main Authors: Denisova, L. T., Molokeev, M. S., Kargin, Yu. F., Golubeva, E. O., Belousova, N. V., Denisov, V. M.
Format: Article
Language:English
Subjects:
Apatite
Chemistry
Chemistry and Materials Science
Crystal structure
Germanium oxides
High temperature
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Lead oxides
Materials Science
Specific heat
Thermodynamic properties
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Summary:Pb 10 – x Sm x (GeO 4 ) 2 + x (VO 4 ) 4 – x ( x = 0.2, 0.5, 0.7, 1.0) compounds with the apatite structure have been synthesized by firing appropriate mixtures of the PbO, Sm 2 O 3 , GeO 2 , and V 2 O 5 oxides in air at temperatures from 773 to 1073 K. Their crystal structure has been studied using X-ray diffraction, and their high-temperature heat capacity (350–1000 K) has been determined by differential scanning calorimetry. The data have been used to evaluate their thermodynamic properties.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168522070081