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Issue 1, 2001
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Magnetic properties of ultrafine cobalt ferriteparticles synthesized by hydrolysis in a polyol medium

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Abstract

Fine CoFe2O4 powders with monodisperse, almost equi-axial nanometer-sized particles were synthesised in a polyol medium by forced hydrolysis of ionic Co(II) and Fe(III) salts at 160 °C. K(Co) XANES and 57Fe Mössbauer spectroscopy show that the structure of this ferrite is slightly deviated from an inverse spinel structure: 16% of cobalt atoms are in tetrahedral sites. The particles are superparamagnetic above 300 K and ferrimagnetic below this blocking temperature with, at low temperature, strong coercivity, a saturation magnetisation value close to the bulk value and high reduced remanence. The saturation magnetisation measured at 5 K is clearly enhanced with respect to CoFe2O4 nanometer-sized particles previously prepared by other methods. These magnetic characteristics suggest that these particles have a high crystallinity which may result from this novel synthesis route.

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Publication details

The article was received on 28 Apr 2000, accepted on 11 Jul 2000 and first published on 12 Oct 2000


Article type: Paper
DOI: 10.1039/B003193N
Citation: J. Mater. Chem., 2001,11, 186-192
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    Magnetic properties of ultrafine cobalt ferrite particles synthesized by hydrolysis in a polyol medium

    S. Ammar, A. Helfen, N. Jouini, F. Fiévet, I. Rosenman, F. Villain, P. Molinié and M. Danot, J. Mater. Chem., 2001, 11, 186
    DOI: 10.1039/B003193N

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