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Article

Thermophysical Properties of Materials
2010. V. 48. № 2. P. 198–204
Kasenov B.K., Edil'baeva S.T., Kasenova Sh.B., Sagintaeva Zh.I., Davrenbekov S.Zh., Tuhmetova Zh.K., Akubaeva M.A.
A thermodynamic investigation of NdMe3Sr3Mn4O12 (Me — Li, Na, K) manganites in the range from 298.15 to 673 K
Annotation
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 Copf(T) in the range from 298.15 to 673 K. The temperature dependences of permittivity and electrical resistance of manganites are investigated at 303503 K; these dependences likewise confirm the presence of second-order phase transitions.
Article reference:
Kasenov B.K., Edil'baeva S.T., Kasenova Sh.B., Sagintaeva Zh.I., Davrenbekov S.Zh., Tuhmetova Zh.K., Akubaeva M.A. A thermodynamic investigation of NdMe3Sr3Mn4O12 (Me — Li, Na, K) manganites in the range from 298.15 to 673 K, High Temp., 2010. V. 48. № 2. P. 198