Fe doping effect on EuTiO3: The magnetic properties and giant magnetocaloric effect

The magnetic properties and magnetocaloric effect for EuTi1-xFexO3 (x = 0.05, 0.1) compounds are investigated. When a part of Ti(4+)ions were substituted by Fe ions, the AFM ordering can be significantly changed to be FM. The EuTi1-xFexO3 (x = 0.05, 0.1) compounds exhibit a PM to FM transition with decreasing temperature and the Curie temperature is 6 K. Under the field changes of 1 T, -Delta SMmax and RC are valued to be 10.1 J/kg K and 50.2 J/kg for EuTi0.95Fe0.05O3; 9.6 J/kg K and 47.7 J/kg for EuTi0.9Fe0.1O3, without magnetic and thermal hysteresis. RC is almost twice as much as EuTiO3 (27 J/kg) as substitution of Fe3+ ions for Ti(4+)ions, which may be attributed to the magnetic transition (AFM to FM). Therefore, the giant -Delta SMmax and large RC suggest the EuTi1-xFexO3 compounds are good materials for magnetic refrigerant.