Unusual oxidation states give reversible room temperature magnetocaloric effect on perovskite-related oxides SrFe{sub 0.5}Co{sub 0.5}O{sub 3}

Journal Article · Thu Dec 15 04:00:00 EST 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.10.002· OSTI ID:21612820

Yin, C; Liu, Q; Decourt, R; Pollet, M; Gaudin, E ^[1]; Toulemonde, O ^[1]

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1. CNRS, Universite de Bordeaux, ICMCB, 87 avenue du Dr. A. Schweitzer, Pessac F-33608 (France)

The magnetic properties and the magnetocaloric effect are presented for the perovskite-related oxide SrFe{sub 0.5}Co{sub 0.5}O{sub 3} prepared using electrochemical oxidation. SrFe{sub 0.5}Co{sub 0.5}O{sub 3} exhibits a second order paramagnetic-ferromagnetic transition close to room temperature (T{sub C}=330 K). The maximal magnetic entropy change {Delta}S{sub M}{sup Max} , the maximal adiabatic temperature change {Delta}T{sub 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. - Graphical Abstract: Moderate 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. Highlights: Black-Right-Pointing-Pointer Both Fe{sup 4+} and Co{sup 4+} are stabilized on perovskite-related phase SrFe{sub 0.5}Co{sub 0.5}O{sub 3} using electrochemical oxidation. Black-Right-Pointing-Pointer Its crystallographic structure is cubic. Black-Right-Pointing-Pointer SrFe{sub 0.5}Co{sub 0.5}O{sub 3} is metal-like/ferromagnetic below 330 K Black-Right-Pointing-Pointer SrFe{sub 0.5}Co{sub 0.5}O{sub 3} exhibits magnetocaloric properties associated with the sharp paramagnetic to ferromagnetic phase transition.

• OSTI ID: 21612820
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 12 Vol. 184; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
CRYSTALLOGRAPHY
ELECTROCHEMISTRY
ELEMENTS
ENTROPY
FERROMAGNETISM
MAGNETIC PROPERTIES
MAGNETISM
METALS
MINERALS
OXIDATION
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARAMAGNETISM
PEROVSKITE
PEROVSKITES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES