A thermodynamic investigation of NdMe3Sr3Mn4O12 (Me—Li, Na, K) manganites in the range from 298.15 to 673 K

Bulat Kunurovich Kasenov, S. T. Edil’baeva, Zhenisgul Imangalievna Sagintaeva, С. Ж. Давренбеков, Zh. K. Tukhmetova, M. A. Akubaeva

2010

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DOI 10.1134/s0018151x10020100

Data confidence 70 medium

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Abstract

High-temperature synthesis according to ceramic technology is used to prepare new manganites NdMe3Sr3Mn4O12 (Me—Li, Na, K). The X-ray powder method is used to find that the compounds crystallize in tetragonal syngony, and the parameters of their crystal lattices are determined. The method of dynamic calorimetry is used in the range from 298.15 to 673 K for determining the heat capacity of manganites; in so doing, the presence of second-order phase transitions is revealed. In view of phase transitions, equations are derived which describe the dependence C ℴ ∼ f(T) in the range from 298.15 to 673 K. The temperature dependences of permittivity and electrical resistance of manganites are investigated at 303–503 K; these dependences likewise confirm the presence of second-order phase transitions.