Synthesis, crystal structure and thermodynamic properties of Ca3Y2Ge3O12 germanate

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Abstract

Orthogermanate Ca3Y2Ge3O12 has been prepared by solid-phase method from CaCO3, Y2O3 and GeO2 by firing in air at a temperature of 1773 K. Using X-ray diffraction, its crystal structure was clarified (sp. gr. Ia3¯d, a =12.80255(14) Å, V = 2098.34(7) Å3). The high-temperature heat capacity of oxide compound has been determined in the temperature range 320–1000 K by differential scanning calorimetry and the experimental data have been used to evaluate thermodynamic properties of Ca3Y2Ge3O12.

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About the authors

L. T. Denisova

Siberian Federal University

Author for correspondence.
Email: ldenisova@sfu-kras.ru
Russian Federation, Krasnoyarsk, 660041

D. V. Belokopytova

Siberian Federal University

Email: ldenisova@sfu-kras.ru
Russian Federation, Krasnoyarsk, 660041

Yu. F. Kargin

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

Email: ldenisova@sfu-kras.ru
Russian Federation, Moscow, 119991

G. V. Vasil’ev

Siberian Federal University

Email: ldenisova@sfu-kras.ru
Russian Federation, Krasnoyarsk, 660041

V. M. Denisov

Siberian Federal University

Email: ldenisova@sfu-kras.ru
Russian Federation, Krasnoyarsk, 660041

V. V. Beletskii

Siberian Federal University

Email: ldenisova@sfu-kras.ru
Russian Federation, Krasnoyarsk, 660041

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2. Fig. 1. Effect of temperature on the molar heat capacity of Ca3Y2Ge3O12: 1 – experiment, 2 – calculation of НК2, 3 – calculation of НК1, 4 – calculation by the group contribution method, 5 – calculation of НК3

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3. Fig. 2. Temperature dependences of the molar heat capacity of germanates Ca3Y2Ge3O12 (1), CaY2Ge4O12 (2) and CaY2Ge3O10 (3)

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