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Persistent URL http://purl.org/net/epubs/work/34557
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Record Id 34557
Title Crystal structure and magnetic properties of Fe2OBO3
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
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Language English (EN)
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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