A giant magnetocaloric effect in EuTi0.875Mn0.125O3 compound

The magnetic properties and magnetocaloric effect of EuTi0.875Mn0.125O3 compounds are investigated. EuTi0.875Mn0.125O3 compounds show the ferromagnetic to paramagnetic magnetic transition at Tc = 5.5 K. There are 15.48% Eu2+ ions that change into Eu3+, because the concentrations of Mn2+ and Mn4+ are 7.74% and 4.76% in the EuTi0.875Mn0.125O3 compounds. Although, the magnetic moments were decreased, the utilization of spin entropy of Eu2+: 4f7 localized moments was improved. A giant reversible magnetocaloric effect was observed in EuTi0.875Mn0.125O3 compounds. The maximum value of magnetic entropy change are (12.3 and 23.3 J/kg K), and the values of RC were evaluated to be 46 and 123 J/kg for a field change of 1 and 2 T, without thermal and field hysteresis loss. Therefore, the giant reversible MCE and large RC make the EuTi0.875Mn0.125O3 compound a good candidate for magnetic refrigerant working at low-temperature and low-field.