Prediction of thermomagnetic properties of La_0.67Ca_0.33MnO₃ and La_0.67Sr_0.33MnO₃

Abstract

The dependence of magnetization on the variation of temperature for La_0.67Ca_0.33MnO₃ and La_0.67Sr_0.33MnO₃ perovskite-type ceramic materials under an external magnetic field was modelled. Application of phenomenological model was performed, showing a good agreement with the experimental data. Temperature dependence of change of both magnetic entropy and specific heat under magnetic field 0.05 T was predicted for La_0.67Ca_0.33MnO₃ and La_0.67Sr_0.33MnO₃. Predicted values of maximum magnetic entropy change, full-width at half-maximum, relative cooling power and maximum specific heat under 0.05 T were evaluated.

Keywords:

• magnetocaloric effect
• model
• magnetization
• magnetic entropy change
• relative cooling power
• specific heat