Synthesis and High-Temperature Thermodynamic Properties of InFeGe2O7 and GdFeGe2O7.

Authors :: Denisova, L. T.
Irtyugo, L. A.
Kargin, Yu. F.
Beletskii, V. V.
Belousova, N. V.
Denisov, V. M.
Source :: Russian Journal of Inorganic Chemistry; Jul2020, Vol. 65 Issue 7, p955-959, 5p
Publication Year :: 2020
Abstract: Germanates InFeGe<subscript>2</subscript>O<subscript>7</subscript> and GdFeGe<subscript>2</subscript>O<subscript>7</subscript> have been produced in the form of polycrystalline powders from stoichiometric mixtures of In<subscript>2</subscript>O<subscript>3</subscript> (Gd<subscript>2</subscript>O<subscript>3</subscript>), Fe<subscript>2</subscript>O<subscript>3</subscript>, and GeO<subscript>2</subscript> by solid-phase synthesis. Calcination was carried out in air in the temperature range 1273–1473 K. The high-temperature heat capacities of these oxide compounds have been measured using differential scanning calorimetry. The resulting experimental C<subscript>p</subscript> = f(T) data were used to calculate the thermodynamic functions (the enthalpy and entropy changes) of the investigated Fe–In and Fe–Gd germanates. [ABSTRACT FROM AUTHOR]

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