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


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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.

About the authors

L. T. Denisova

Institute of Nonferrous Metals and Materials Science, Siberian Federal University

Author for correspondence.
Email: antluba@mail.ru
Russian Federation, Svobodnyi pr. 79, Krasnoyarsk, 660041

Yu. F. Kargin

Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences

Email: antluba@mail.ru
Russian Federation, Leninskii pr. 49, Moscow, 119991

E. O. Golubeva

Institute of Nonferrous Metals and Materials Science, Siberian Federal University

Email: antluba@mail.ru
Russian Federation, Svobodnyi pr. 79, Krasnoyarsk, 660041

N. V. Belousova

Institute of Nonferrous Metals and Materials Science, Siberian Federal University

Email: antluba@mail.ru
Russian Federation, Svobodnyi pr. 79, Krasnoyarsk, 660041

V. M. Denisov

Institute of Nonferrous Metals and Materials Science, Siberian Federal University

Email: antluba@mail.ru
Russian Federation, Svobodnyi pr. 79, Krasnoyarsk, 660041

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