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High temperature heat capacity and thermodynamic properties of CaEu2Ge4O12 and CaHo2Ge4O12 germanates in the range of 320-1050 K
Russian version
Galiakhmetova N. A.1, Denisovf L. T.1, Vasilev G. V.1, Denisov V. M.1
1Siberian Federal University, Krasnoyarsk, Russia
Email: ldenisova@sfu-kras.ru
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The germanates CaEu2Ge4O12 and CaHo2Ge4O12 were synthesized from stoichiometric mixtures of CaO, Eu2O3 (Ho2O3) and GeO2 by sequential firing in air in the temperature range 1223-1373 K. Their crystal structure has been refined using X-ray diffraction. The heat capacity Cp of the obtained germanates was measured by differential scanning calorimetry in the region of 320-1050 K. Based on the experimental dependence of Cp(T), the thermodynamic characteristics of the analyzed oxide compounds are calculated. Keywords: calcium germanates of europium and holmium, solid-phase synthesis, differential scanning calorimetry, high-temperature heat capacity, thermodynamic properties.
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