Synthesis and X-ray diffraction and calorimetric studies of LaLiMnFeO5 and LaCsMnFeO5 ferrites

Bulat Kunurovich Kasenov, Е. С. Мустафин, M. A. Akubaeva, Zhenisgul Imangalievna Sagintaeva, S. T. Edil’baeva, С. Ж. Давренбеков, O. I. Zharkeshov

2008

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DOI 10.1134/s0036023608090179

Data confidence 70 medium

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Abstract

Ferrites LaLiMnFeO5 and LaCsMnFeO5 were synthesized for the first time by ceramic technology from mixtures of lanthanum(III), manganese, and iron(III) oxides with lithium or cesium carbonate. The compounds were shown by X-ray diffraction to crystallize in the orthorhombic system; the unit cell parameters were determined. The heat capacities were found experimentally for 298.15–673 K. Equations for the heat capacities as a function of temperature were derived and used to calculate the thermodynamic functions C 0 (T), S 0(T), H 0(T)−H 0(298.15), and Φ**(T) for the above temperature range.