Structure and Thermodynamic Properties of the SmGaGe2O7 Oxide

L. T. Denisova, M. S. Molokeev, L. A. Irtyugoa, V. V. Beletskii, N. V. Belousova, and V. M. Denisov doi:10.1134/s1063783420020109 Physics of the Solid State, 2020, Vol. 62, No. 2, pp. 384–387

The SmGaGe2O7 oxide material has been obtained from initial Sm2O3, Ga2O3, and GeO2 oxides by solid-phase synthesis with annealing in air in the temperature range of 1273–1473 K. The structure of the investigated germanate (sp. gr. P21/c, a = 7.18610(9) Å, b = 6.57935(8) Å, and c = 12.7932(2) Å) has been established by X-ray diffraction and the high-temperature heat capacity has been determined by differential scanning calorimetry. Using the experimental data on Cp = f(T), the thermodynamic properties of the compound have been calculated.