Results of an experimental study of the heat capacity (Cp), as well as direct and indirect measurements of the MCE (∆T, ∆S) of La0.7Sr0.3-xBaxMnO3 samples (x = 0, 0.02, 0.05, 0.10) in the temperature range 80–400 K and in magnetic fields up to 1.8 T are presented. It is shown that the partial substitution of barium (Ba) for strontium (Sr) shifts TC and insignificantly decreases the magnetocaloric effect. The maximum value of the change in entropy in a field of 1.8 T is ∆S = 1.6 J/kg·K for x = 0.02. The entropy change associated with the disordering of the magnetic system during the ferromagnetic-paramagnetic phase transition is estimated.
|Translated title of the contribution||Heat capacity and magnetocaloric effect in manganites La0.7Sr0.3-xBaxMnO3|
|Number of pages||8|
|Journal||Chelyabinsk Physical and Mathematical Journal|
|Publication status||Published - 2021|
- Heat capacity
- Magnetocaloric effect
- Phase transitions