Heat capacities and thermodynamic functions of new nanosized ferro-chromo-manganites LaM0.5 IIFeCrMnO6.5 (MII–Mg, Ca, Sr, Ba)

The heat capacities of nanosized ferro-chromo-manganites LaM0.5IIFeCrMnO6.5 (MII–Mg, Ca, Sr, Ba) are measured via dynamic calorimetry in the temperature range of 298.15–673 K using an IT-S-400 instrument. It is established that the C°p~f(T) function of LaM0.5IIFeCrMnO6.5 (MII–Mg, Ca, Sr, Ba) has λ-t...

Full description

Saved in:
Bibliographic Details
Published in:Russian Journal of Physical Chemistry A 2017-03, Vol.91 (3), p.430-436
Main Authors: Kasenov, B. K., Kasenova, Sh. B., Sagintaeva, Zh. I., Turtubaeva, M. O., Kakenov, K. S., Esenbaeva, G. A.
Format: Article
Language:English
Subjects:
Barium
Calcium
Magnesium
Manganites
Phase transitions
Specific heat
Strontium
Thermodynamics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The heat capacities of nanosized ferro-chromo-manganites LaM0.5IIFeCrMnO6.5 (MII–Mg, Ca, Sr, Ba) are measured via dynamic calorimetry in the temperature range of 298.15–673 K using an IT-S-400 instrument. It is established that the C°p~f(T) function of LaM0.5IIFeCrMnO6.5 (MII–Mg, Ca, Sr, Ba) has λ-type effects, due probably to phase transitions of the second order. Considering the temperatures of the phase transitions, equations of the heat capacity of ferro-chromo-manganites LaM0.5IIFeCrMnO6.5 (MII–Mg, Ca, Sr, Ba) as a function of temperature are derived on the basis of experimental data. Thermodynamic functions Н°(Т)–Н°(298.15), S°(Т), and Фхх(Т) are calculated in the temperature range of 298.15–675 K.
ISSN:0036-0244
1531-863X
DOI:10.1134/S0036024417030116