Unusual oxidation states give reversible room temperature magnetocaloric effect on perovskite-related oxides SrFe_0.5Co_0.5O₃

C. Yin (1) , Liu Qiang (1) , Rodolphe Decourt (1) , Michaël Pollet (1) , Etienne Gaudin (1) , Olivier Toulemonde (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

The magnetic properties and the magnetocaloric effect are presented for the perovskite-related oxide SrFe_0.5Co_0.5O₃ prepared using electrochemical oxidation. SrFe_0.5Co_0.5O₃ exhibits a second order paramagnetic-ferromagnetic transition close to room temperature (T_C=330 K). The maximal magnetic entropy change ΔS_M^Max , the maximal adiabatic temperature change ΔT_ad 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.

Mots clés: Electrochemical oxidation; Ferromagnetism; Solid solution; Magnetocaloric effect

Domaines: Matériaux

C. Yin, Liu Qiang, Rodolphe Decourt, Michaël Pollet, Etienne Gaudin, et al.. Unusual oxidation states give reversible room temperature magnetocaloric effect on perovskite-related oxides SrFe_0.5Co_0.5O₃. Journal of Solid State Chemistry, 2011, 184 (12), pp.3228-3231. ⟨10.1016/j.jssc.2011.10.002⟩. ⟨hal-00647803⟩