Observation of giant magnetocaloric effect in EuTi1-xCrxO3

• EuTi1−xCrxO3 compound exhibits a giant reversible MCE.
• The AFM ordering of pure EuTiO3 can be significantly changed to be FM with slight Cr-doping.
• Under field changes of 2 T, the value of −ΔSMmax−ΔSMmax is 22.5 J/kg K and the RC is 127J/kg, respectively.

The magnetic properties and magnetocaloric effect in EuTi1−xCrxO3 (x = 0, 0.02, 0.04, 0.1) compounds are investigated. The magnetic ground state (AFM) of pure EuTiO3 can be significantly changed to be FM with slight Cr-doping. A giant reversible MCE and large RC in EuTi1−xCrxO3 compounds were observed. The value of −ΔSMmax−ΔSMmax reaches to 40.3 J/kg K for EuTiO3 under the magnetic field change of 5 T. Especially, under the magnetic field changes of 1 and 2 T, the values of −ΔSMmax−ΔSMmax are evaluated to be 12.5 and 22.5 J/Kg K and the maximum values of RC are 64 and 127 J/kg, without magnetic and thermal hysteresis for EuTi1−xCrxO3 system. Therefore, the giant reversible MCE and large RC make the EuTi1−xCrxO3 compounds could be considered as a good candidate material for low-temperature and low-field magnetic refrigerant.

Under the magnetic field changes of 2 T, the values of −ΔSMmax−ΔSMmax are 22.3 J/kg K, 22.5 J/kg K, 20.3 J/kg K and 16.8 J/kg K for EuTi1-xCrxO3 (x = 0, 0.02, 0.04, 0.1), respectively. And the values of RC are around 100–127 J/kg.Figure optionsDownload as PowerPoint slide