The calorimetry and thermodynamic functions of Nd MgI3Mn4O12 (MeI-Li, Na, K) manganites in the range from 298.15 to 673 K

Bulat Kunurovich Kasenov, Е. С. Мустафин, Zhenisgul Imangalievna Sagintaeva, S. T. Edil’baeva, С. Ж. Давренбеков

2009

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DOI 10.1134/s0018151x09010040
Data confidence 70 medium
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Abstract

The ceramic technology is employed for synthesizing manganites of composition Nd Mg 3 I Mg3Mn4O12(MeI-Li, Na, K). The X-ray technique is used to find that the compounds crystallize in tetragonal syngony. The parameters of their crystal lattices are determined. Their heat capacities are experimentally determined in the range from 298.15 to 673 K, which enables one to reveal second-order phase transitions. In view of these transitions, equations describing the C ° ∼ f(T) dependence are derived, and the thermodynamic functions C ° (T), H°(T)-H°(298.15), S°(T), and Φ xx (T) are calculated.