High pressure synthesis, crystal, magnetic structure and magnetotransport of SrFe{sub 0.5}Co{sub 0.5}O{sub 3-{delta}}

Journal Article · Wed Nov 15 04:00:00 EST 2006 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2006.07.004· OSTI ID:20900878

Munoz, A ^[1]; Alonso, J A ^[2]; Martinez-Lope, M J ^[2]; Calle, C de la ^[2]; Fernandez-Diaz, M T ^[3]

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1. Departamento de Fisica Aplicada, Escuela Politecnica Superior, Universidad Carlos III de Madrid, Avda. de la Universidad, 30, E-28911 Leganes-Madrid (Spain)
2. Instituto de Ciencia de los Materiales de Madrid, CSIC, E-28049 Cantoblanco-Madrid (Spain)
3. Institute Laue-Langevin (ILL) 156X, F-38042 Grenoble Cedex 9 (France)

A polycrystalline sample with SrFe{sub 0.5}Co{sub 0.5}O{sub 3-{delta}} stoichiometry has been prepared under moderate pressures of 2GPa in the presence of KClO{sub 4} as oxidizing agent. The crystallographic and magnetic structures have been studied from neutron powder diffraction (NPD), complemented with magnetotransport and magnetic susceptibility data. The study of the crystallographic structure confirms that this compound, with the actual stoichiometry SrFe{sub 0.5}Co{sub 0.5}O{sub 2.88(3)}, is a simple cubic perovskite at 2 and 295K, defined in the Pm-3m space group, where Fe and Co atoms are distributed at random over the B positions. The magnetic measurements show that SrFe{sub 0.5}Co{sub 0.5}O{sub 2.88} is a ferromagnet with T{sub C}{approx}330K, which is also confirmed by neutron diffraction: the magnetic structure is collinear, characterized by a propagation vector k=0; the ordered magnetic moment values for the (Fe{sup 4+},Co{sup 4+}) cations are 1.54(9) and 0.65(15){mu}{sub B} at T=2 and 295K, respectively. Transport measurements show a semiconductinhaviour, and a negative magnetoresistance (MR) of -6.5% is observed at T=5K for H=9T.

• OSTI ID: 20900878
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 11 Vol. 179; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT IONS
COBALT OXIDES
CRYSTALLOGRAPHY
CUBIC LATTICES
FERROMAGNETISM
IRON IONS
IRON OXIDES
MAGNETIC MOMENTS
MAGNETIC SUSCEPTIBILITY
MAGNETORESISTANCE
NEUTRON DIFFRACTION
PEROVSKITE
POLYCRYSTALS
POTASSIUM PERCHLORATES
SPACE GROUPS
STOICHIOMETRY
STRONTIUM OXIDES
SYNTHESIS
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0273-0400 K