Effects of Mn-doping on the giant magnetocaloric effect of EuTiO3 compound

Highlights: • The AFM ordering of pure EuTiO₃ can be significantly changed to be FM with slight Mn-doping. • The values of −ΔS_M^max are evaluated to 11.7 J/kg K for EuTi_0.975Mn_0.025O₃ compounds, under a magnetic field change of 1 T. • The values of RC were obviously enhanced under the magnetic field changes of 1 and 2 T. The magnetic properties and magnetocaloric effect of EuTi_1−xMn_xO₃ (x = 0–0.1) compounds are investigated. When the Ti⁴⁺ was substituted by Mn²⁺, the lattice constants were changed, the Eu³⁺ state and the oxygen vacancy generated. The exchange mechanisms were more complex among the Mn²⁺ 3d, the Eu 5d and Eu²⁺ 4f. The FM phase was dominant between AFM and FM as Mn substitute for Ti, which improve the MCE under low magnetic field. The values of −ΔS_M^max are evaluated to 11.7 and 11.1 J/kg K for EuTi_0.975Mn_0.025O₃ and EuTi_0.95Mn_0.05O₃ compounds, under a magnetic field change of 1 T. And, the values of RC were obviously enhanced under the magnetic field changes of 1 and 2 T. Therefore, the giant reversible MCE makes these compounds promising candidates for magnetic refrigeration.