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

H. El Shinawi; J. F. Marco; F. J. Berry; C. Greaves

doi:10.1039/B927141D

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LaSrCoFeO₅, LaSrCoFeO₅F and LaSrCoFeO_5.5: new La–Sr–Co–Fe perovskites†

H. El Shinawi,^a J. F. Marco,^b F. J. Berry^ac and C. Greaves*^a

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* Corresponding authors

^a School of Chemistry, University of Birmingham, Birmingham, UK
E-mail: c.greaves@bham.ac.uk

^b Instituto de Quimica-Fisica “Rocasolano”, CSIC, Serrano 119, Madrid, Spain

^c Department of Chemistry, The Open University, Milton Keynes, UK

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 LaSrCoFeO_5.58 are synthesized by fluorination and room temperature air oxidation of LaSrCoFeO₅, respectively. LaSrCoFeO_5.56 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.

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Supplementary files

The neutron powder diffraction patterns for a quenched material (LaSrCoFeO _5.56) and a sample with similar composition (LaSrCoFeO _5.58) obtained from low temperature oxidation of LaSrCoFeO ₅ PDF (368K)

Article information

DOI: https://doi.org/10.1039/B927141D
Article type: Paper
Submitted: 23 Dec 2009
Accepted: 17 Feb 2010
First published: 08 Mar 2010

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J. Mater. Chem., 2010,20, 3253-3259

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LaSrCoFeO₅, LaSrCoFeO₅F and LaSrCoFeO_5.5: new La–Sr–Co–Fe perovskites

H. El Shinawi, J. F. Marco, F. J. Berry and C. Greaves, J. Mater. Chem., 2010, 20, 3253 DOI: 10.1039/B927141D

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Journal of Materials Chemistry