Synthesis and High-Temperature Heat Capacity of Dy2Ge2O7 and Ho2Ge2O7


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The Dy2Ge2O7 and Ho2Ge2O7 pyrogermanates have been prepared by solid-state reactions in several sequential firing steps in the temperature range 1237–1473 K using stoichiometric mixtures of Dy2O3 (or Ho2O3) and GeO2. The heat capacity of the synthesized germanates has been determined as a function of temperature by differential scanning calorimetry in the range 350–1000 K. The experimentally determined Cp(T) curves of the dysprosium and holmium germanates have no anomalies and are well represented by the Maier–Kelley equation. The experimental Cp(T) data have been used to evaluate the thermodynamic functions of the Dy2Ge2O7 and Ho2Ge2O7 pyrogermanates: enthalpy increment H°(T)–H°(350 K), entropy change S°(T)–S°(350 K), and reduced Gibbs energy Ф°(T).

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L. Denisova

Institute of Nonferrous Metals and Materials Science

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Email: antluba@mail.ru
俄罗斯联邦, Svobodnyi pr. 79, Krasnoyarsk, 660041

L. Irtyugo

Institute of Nonferrous Metals and Materials Science

Email: antluba@mail.ru
俄罗斯联邦, Svobodnyi pr. 79, Krasnoyarsk, 660041

Yu. Kargin

Baikov Institute of Metallurgy and Materials Science

Email: antluba@mail.ru
俄罗斯联邦, Leninskii pr. 49, Moscow, 119334

N. Belousova

Institute of Nonferrous Metals and Materials Science

Email: antluba@mail.ru
俄罗斯联邦, Svobodnyi pr. 79, Krasnoyarsk, 660041

V. Beletskii

Institute of Nonferrous Metals and Materials Science

Email: antluba@mail.ru
俄罗斯联邦, Svobodnyi pr. 79, Krasnoyarsk, 660041

V. Denisov

Institute of Nonferrous Metals and Materials Science

Email: antluba@mail.ru
俄罗斯联邦, Svobodnyi pr. 79, Krasnoyarsk, 660041

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