Calculation of Thermodynamic Properties of Germanates Ca3R 2Ge3O12 (R = Y, Er - Lu)
In this work, the standard enthalpy of formation, the standard entropy, and temperature dependence of the heat capacity of compounds with a garnet-like structure Ca3R2Ge3O12 (R = Y, Er - Lu) were determined by various calculation methods. Based on the obtained data, the changes in the Gibbs energy o...
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Published in | Journal of Siberian Federal University. Chemistry Vol. 15; no. 3; pp. 409 - 419 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Krasnoyarsk
Siberian Federal University
01.01.2022
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Subjects | |
Online Access | Get full text |
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Summary: | In this work, the standard enthalpy of formation, the standard entropy, and temperature dependence of the heat capacity of compounds with a garnet-like structure Ca3R2Ge3O12 (R = Y, Er - Lu) were determined by various calculation methods. Based on the obtained data, the changes in the Gibbs energy of synthesis reactions these germanates in the range of 273-1800 K were calculated: a) from initial oxides, b) from calcium carbonate and initial GeO2 and R2O3, c) from initial oxides and pseudobinary compounds. It is shown that the solid-phase synthesis of Ca3R2Ge3O12 garnets is the most thermodynamically advantageous using initial oxides or a mixture of R2O3 and CaGeO3. |
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ISSN: | 1998-2836 2313-6049 |
DOI: | 10.17516/1998-2836-0304 |