Giant low-field magnetic refrigeration in EuTi1−xAlxO3 (x = 0.05, 0.1 and 0.15) compounds

The EuTi_1−xAl_xO₃ (x = 0.05, 0.1 and 0.15) compounds exhibit the ferromagnetic state. A giant reversible MCE of EuTi_1−xAl_xO₃ (x = 0.05, 0.1, 0.15) compounds was observed, which was attributed to the increase of ferromagnetic ordering. With increasing the Al content, the value of −ΔS_M^max is increased from 11.6 J/kg K to15.6 J/kg K for EuTi_1−xAl_xO₃, and the RC values are 48.4 J/kg for EuTi_0.95Al_0.05O₃, 53.1 J/kg for EuTi_0.9Al_0.1O₃ and 58.2 J/kg for EuTi_0.85Al_0.15O₃ with magnetic field change 0–1 T. Additionally, the maximum value of ΔT_ad is 4.7 K for EuTi_0.85Al_0.15O₃ compound as magnetic field changes 1 T. The EuTi_1−xAl_xO₃ with giant −ΔS_M, large RC and large ΔT_ad suggest an important material for magnetic refrigerant at low-temperature.