Heat capacity and thermodynamic functions of new cobaltic manganites NdM 2 II CoMnO6 (MII is Mg, Ca, Sr, or Ba) Within the temperature range of 298.15–673 K

The results of thermodynamic studies of the cobaltic manganites NdM 2 II CoMnO6 (MII is Mg, Ca, Sr, or Ba) are presented. In the calorimetric studies of the heat capacity within the range of 298.15–673 K, a second kind λ-shaped phase transitions in the Cp(T) dependences was discovered: at the temper...

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Bibliographic Details
Published in:High temperature 2016-07, Vol.54 (4), p.514-518
Main Authors: Kasenov, B. K., Turtubaeva, M. O., Amerkhanova, Sh. K., Nikolov, R. N., Kasenova, Sh. B., Sagintaeva, Zh. I.
Format: Article
Language:English
Subjects:
Barium
Calcium
Enthalpy
Magnesium
Manganites
Phase transitions
Specific heat
Strontium
Temperature dependence
Thermodynamics
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Summary:The results of thermodynamic studies of the cobaltic manganites NdM 2 II CoMnO6 (MII is Mg, Ca, Sr, or Ba) are presented. In the calorimetric studies of the heat capacity within the range of 298.15–673 K, a second kind λ-shaped phase transitions in the Cp(T) dependences was discovered: at the temperatures of 373 and 523 K for NdMg2CoMnO6; at 348 and 498 K for NdCa2CoMnO6; at 423 and 548 K for NdSr2CoMnO6; and at 323 and 498 K for NdBa2CoMnO6. We derive the equations for the temperature dependence of the heat capacity with account for these phase transitions. We calculate the temperature dependences of the thermodynamic functions: entropy, S0(T), enthalpy, H0(T)–H0(298.15), and the reduced thermodynamic potential, Φxx(T), of the studied manganites.
ISSN:0018-151X
1608-3156
DOI:10.1134/S0018151X16040106