Reduction of FeVO₄ to synthesise nanocrystalline ferrovanadium alloy

Authors: Bahgat, M.; Khedr, M. H.; Shaaban, M. K.

Source: Materials Technology: Advanced Performance Materials, Volume 23, Number 1, March 2008 , pp. 13-18(6)

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Abstract:

Iron(III) vanadate was prepared by calcination of a stoichiometric mixture of vanadium metal and iron oxide. Compacts of the FeVO₄ produced were isothermally reduced in pure hydrogen at 400–800°C and the reduction behaviour and kinetics were studied based on the thermogravimetric analysis. The initial product and the reduction products were characterised by X-ray diffraction analysis, scanning electron microscope and vibrating sample magnetometry. The reduction reaction was found to be controlled by a gaseous diffusion mechanism. Nanocrystalline (73·2 nm) ferrovanadium with metallic iron was obtained after the reduction of FeVO₄ at 600–800°C. The magnetic properties of Fe and FeV alloy were enhanced with increasing reduction temperature: coercivity decreased from 254 to 158·2 Oe with increasing reduction temperature from 400 to 800°C, whereas saturation magnetisation increased from 9·35 to 29·1 emu g^?1.

Keywords: H2 REDUCTION; FEV; FEVO4; MAGNETIC; NANOCRYSTALLITES

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/175355508X266863

Publication date: 2008-03-01

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