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Kasenova S.B.,Abishev Institute of Chemical Metallurgy | Sagintaeva Z.I.,Abishev Institute of Chemical Metallurgy | Kasenov B.K.,Abishev Institute of Chemical Metallurgy | Ermagambet B.T.,Institute of Coal Chemistry and Technologies | And 3 more authors.
Russian Journal of Physical Chemistry A | Year: 2015

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. © 2015 Pleiades Publishing, Ltd. Source


Kasenov B.K.,Abishev Institute of Chemical Metallurgy | Kasenova S.B.,Abishev Institute of Chemical Metallurgy | Sagintaeva Z.I.,Abishev Institute of Chemical Metallurgy | Seisenova A.A.,Abishev Institute of Chemical Metallurgy | And 3 more authors.
Russian Journal of Physical Chemistry A | Year: 2016

Temperature dependences of the heat capacity of new zincate-manganites of LaM2 IIZnMnO6 (MII = Mg, Ca, Sr, Ba) composition are studied via experimental calorimetry in the interval of 298.15-673 K. It is found that all compounds have λ-shape effects on the curve of dependence C p ° ∼ f(T) with respect to phase transitions of the second kind. Equations for the temperature dependence of the heat capacity are derived with allowance for phase transition temperatures, and thermodynamic functions H°(T) - H°(298.15), S°(T) and Φ xx (T) are calculated on the basis of experimental data on C p °(T) and the calculated S°(298.15) value. © 2016 Pleiades Publishing, Ltd. Source

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