Unusual oxidation states give reversible room temperature magnetocaloric effect on perovskite-related oxides SrFe0.5Co0.5O3

The magnetic properties and the magnetocaloric effect are presented for the perovskite-related oxide SrFe0.5Co0.5O3 prepared using electrochemical oxidation. SrFe0.5Co0.5O3 exhibits a second order paramagnetic–ferromagnetic transition close to room temperature (TC=330 K). The maximal magnetic entropy change ΔSMMax , the maximal adiabatic temperature change ΔTad and the refrigerant capacity are found to be equal to respectively 4.0 J/kgK, 1.8 K and 258 J/kg while raising the B-field change from 0 to 5 T.

Graphical AbstractModerate but reversible magnetocaloric properties are associated with the 2nd order paramagnetic to ferromagnetic phase transition exhibited at 330 K. A metal-like behavior is seen for the first time on the ferromagnetic regime.Figure optionsDownload as PowerPoint slideHighlights
► Both Fe4+ and Co4+ are stabilized on perovskite-related phase SrFe0.5Co0.5O3 using electrochemical oxidation.
► Its crystallographic structure is cubic.
► SrFe0.5Co0.5O3 is metal-like/ferromagnetic below 330 K
► SrFe0.5Co0.5O3 exhibits magnetocaloric properties associated with the sharp paramagnetic to ferromagnetic phase transition.