Kasenov B.K.,Abyshev Chemo Metallurgical Institute |
Turtubaeva M.O.,Karaganda State University |
Amerkhanova Sh.K.,Karaganda State University |
Kasenova Sh.B.,Abyshev Chemo Metallurgical Institute |
And 4 more authors.
Russian Journal of Physical Chemistry A | Year: 2015
Temperature dependences of the heat capacities of cobalt manganites LaM2IICoMnO6 (MII = Mg, Ca, Sr, Ba) are investigated by means of dynamic calorimetry in the temperature range of 298.15-673 K. It is established that cobalt manganites display λ-like effects on the Cpo ∼ f(T) curve, which are likely to be related to the type II phase transitions. Equations for the temperature dependence of the heat capacity of cobalt manganites are derived from the experimental data with allowance for phase transition temperatures. The values of Cpo (T) and thermodynamic functions Ho(T) - Ho(298.15), So(T), and Φxx(T) are calculated. © 2015 Pleiades Publishing, Ltd.