Synthesis, structure and properties of a semivalent iron oxoborate, Fe<sub>2</sub>OBO<sub>3</sub>

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Record Id	34559
Title	Synthesis, structure and properties of a semivalent iron oxoborate, Fe₂OBO₃
Contributors	JP Attfield (Cambridge U.), AMT Bell (Cambridge U.), LM Rodriguez-Martinez (Cambridge U.), JM Greneche (Maine U./CNRS), R Retoux (Maine U./CNRS), M Leblanc (Maine U./CNRS), RJ Cernik (CCLRC Daresbury Lab.), JF Clarke (Oxford U.), DA Perkins (Oxford U.)
Abstract	Transition metal oxoborates are of interest for magnetic and optical properties. Crystals of many (M2MO2BO3)-M-II-O-III and (MMOBO3)-M-II-O-III materials can be grown from borate fluxes. In the Fe-II-Fe-III-B-O system, flux growth results in Fe3O2BO3 crystals, but solid state reaction at higher temperatures has yielded Fe2OBO3 as a polycrystalline powder. This has been characterised by synchrotron and neutron diffraction, electron microscopy, Mossbauer spectroscopy, and conductivity and magnetic measurements. Two notable transitions occur, a broad semiconductor-semiconductor change accompanied by a structural transition at 317 K, and L-type ferrimagnetic order below a Curie temperature of 155 K. An average (Fe2+)(0.5)(Fe3+)(0.5), valence is observed at the two crystallographically distinct sites in Fe2OBO3, indicating that charge ordering occurs.
Organisation	CCLRC , SRS , 9.1
Keywords	Materials , Chemistry , warwickite
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Language	English (EN)

Type	Details	URI(s)	Local file(s)	Year
Journal Article	J Mater Chem 9, no. 1 (1999): 205-209. Presented at: Materials Chemistry Discussion No. 1, ICMCB, University of Bordeaux, France, 24-26 Sep 1998.	doi:10.1039/a804642e	jmatchem98.pdf	1999