Heat Capacity of Pb10 – x La x (GeO4)2 + x (VO4)4 – x (x = 0, 1, 2, 3) Apatites in the Range 320–1000 K

Abstract—Pb10 –xLax(GeO4)2 +x(VO4)4 –x (x = 0, 1, 3) compounds with the apatite structure have been prepared by solid-state reactions via multistep firing of appropriate oxide mixtures in air in the temperature range 773–1073 K. The heat capacity of the synthesized polycrystalline samples has been d...

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Bibliographic Details
Published inInorganic materials Vol. 55; no. 2; pp. 162 - 166
Main Authors Denisova, L T, Kargin, Yu F, Golubeva, E O, Belousova, N V, Denisov, V M
Format Journal Article
LanguageEnglish
Published New York Springer Nature B.V 01.01.2019
Subjects
Apatite
Enthalpy
Lanthanum
Mixed oxides
Specific heat
Thermodynamic properties
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Summary:Abstract—Pb10 –xLax(GeO4)2 +x(VO4)4 –x (x = 0, 1, 3) compounds with the apatite structure have been prepared by solid-state reactions via multistep firing of appropriate oxide mixtures in air in the temperature range 773–1073 K. The heat capacity of the synthesized polycrystalline samples has been determined by differential scanning calorimetry. The experimental Cp(T) data have been used to evaluate the thermodynamic properties of the lead lanthanum germanatovanadates: enthalpy increment, entropy change, and reduced Gibbs energy.
ISSN:0020-1685
1608-3172
DOI:10.1134/S002016851902002X