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LaSrCoFeO5, LaSrCoFeO5F and LaSrCoFeO5.5: new La–Sr–Co–Fe perovskites

El Shinawi, H.; Marco, J. F.; Berry, F. J. and Greaves, C. (2010). LaSrCoFeO5, LaSrCoFeO5F and LaSrCoFeO5.5: new La–Sr–Co–Fe perovskites. Journal of Materials Chemistry, 20(16) pp. 3253–3259.

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DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1039/b927141d
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Abstract

The brownmillerite phase LaSrCoFeO5 has been prepared by partially reducing the parent perovskite material LaSrCoFeO6 in 10% H2/N2. The material crystallizes in the Icmm space group with the transition metal ions randomly distributed over the octahedral and tetrahedral sites of the structure. The material shows G-type antiferromagnetic order at room temperature which is consistent with the presence of high spin Co2+ and Fe3+. The perovskite phases LaSrCoFeO5F and LaSrCoFeO5.58 are synthesized by fluorination and room temperature air oxidation of LaSrCoFeO5, respectively. LaSrCoFeO5.56 could be prepared by quenching the sample from 1300°C into liquid nitrogen. Neutron powder diffraction data, Mössbauer spectroscopy and magnetic susceptibility measurements suggest a G-type antiferromagnetism in these materials at room temperature due to the presence of Co3+ in the high spin state, which is not common in this type of materials.

Item Type: Journal Article
Copyright Holders: 2010 Royal Society of Chemistry
ISSN: 0959-9428
Academic Unit/Department: ?? scie-dche ??
Item ID: 21729
Depositing User: Astrid Peterkin
Date Deposited: 10 Jun 2010 12:04
Last Modified: 01 Nov 2012 05:20
URI: http://oro.open.ac.uk/id/eprint/21729
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