Heat capacity and thermodynamic functions of nanostructured manganese ferrites of composition NdMe1.5MnFeO6 (Me = Mg, Ca, Sr, and Ba) in the temperature range from 298.15 to 673 K

Bulat Kunurovich Kasenov, Zhenisgul Imangalievna Sagintaeva, Б. Т. Ермагамбет, А. А. Сейсенова, Е. Е. Куанышбеков, R. T. Sherembaeva

2015

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DOI 10.1134/s0036024415040123

Data confidence 70 medium

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Abstract

The isobaric heat capacities of nanostructured manganese ferrites NdMe1.5MnFeO6, where Me is Mg, Ca, Sr, and Ba, are investigated at ΔT ranging from 298.15 to 673 K by means of dynamic calorimetry. It is established that all of the investigated compounds exhibit λ-shape anomalies on dependence graphs C p ° ∼ (T) that could be due to second-order phase transitions. Dependence equations C p ° ∼ (T) are derived with allowance for the temperatures of phase transitions and the temperature dependences of their thermodynamic functions S°(T), H°(T) − H°(298.15), and Φ xx (T) are calculated for the temperature range of 298.15 to 675 K.