Fe doping effect on EuTiO 3 : The magnetic properties and giant magnetocaloric effect

The magnetic properties and magnetocaloric effect for EuTi 1‐ x F e x O 3 ( 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 EuTi 1‐ x F e x O 3 ( 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, − Δ S M maxand RC are valued to be 10.1 J/kg K and 50.2 J/kg for EuTi 0.95 Fe 0.05 O 3 ; 9.6 J/kg K and 47.7 J/kg for EuTi 0.9 Fe 0.1 O 3 , without magnetic and thermal hysteresis. RC is almost twice as much as EuTiO 3 (27 J/kg) as substitution of Fe 3+ ions for Ti 4+ ions, which may be attributed to the magnetic transition ( AFM to FM ). Therefore, the giant − Δ S M maxand large RC suggest the EuTi 1‐ x F e x O 3 compounds are good materials for magnetic refrigerant.