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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/34557
Record Status
Checked
Record Id
34557
Title
Crystal structure and magnetic properties of Fe2OBO3
Contributors
AMT Bell (Cambridge U.)
,
LM Rodriguez-Martinez (Cambridge U.)
,
JP Attfield (Cambridge U.)
,
RJ Cernik (CCLRC Daresbury Lab.)
,
JF Clarke (Oxford U.)
,
DA Perkins (Oxford U.)
Abstract
Structural and magnetic properties of a new mixed-valent oxoborate Fe2+ Fe3+ OBO3 have been studied from 3K to 337K. Low temperature neutron powder diffraction and high temperature synchrotron X-ray powder diffraction show a change in the symmetry of the warwickite type structure from monoclinic (P2(1)/c) to orthorhombic (Pnma) at 315 K and demonstrate that the two Fe sites are occupied by an exact average Fe2.5+ valence at all temperatures. Magnetisation measurements reveal an ordering transition at T-c = 155 K below which there is a small ferromagnetically ordered component. Neutron diffraction measurements below T-c show an apparent antiferromagnetic ordering but the magnetisation measurements suggest that this is an L-type ferrimagnetic behaviour. Resistivity measurements show a small change in resistivity at 315K.
Organisation
CCLRC
,
SRS
,
9.1
Keywords
Materials
,
Chemistry
,
synchrotron radiation
,
neutron diffraction
,
Rietveld method
,
magnetic materials
,
phase transitions
Funding Information
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Mater Sci Forum
278, no. 2 (1998): 708-713. Is in proceedings of: 5th European Powder Diffraction Conference (EPDIC-V), Parma, Italy, May 1997.
doi:10.4028/www.s….net/MSF.278-281.708
1998
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