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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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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