, Volume 219, Issue 1-3, pp 41-48
Date: 17 Nov 2012

Effect of Co 2 +  content on the magnetic properties of Co x Fe 3 − x O 4 /SiO 2 nanocomposites

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Abstract

Non-stoichiometric CoxFe3 − xO4/SiO2 (x = 0.8, 0.9, 1.0, 1.1) nanocomposites have been prepared by sol-gel method. The structure, morphology and magnetic properties of the obtained samples were characterized by X-ray diffraction, transmission electron microscopy, vibrating sample magnetometer and Mössbauer spectroscopy at room temperature. As the Co2 +  content increases, the average particle size of the spherical CoxFe3 − xO4 in the samples decreases and the lattice constants increases. The hyperfine fields for both A- and B-site decrease, while the fraction of Co2 +  occupying the A-site increases. Magnetization measurements show the saturation magnetization and coercivity of CoxFe3 − xO4/SiO2 decrease with increasing Co2 +  content. The decrease in magnetization results from the weakened A-B interactions between Fe3 + , and the change in coercivity can be related to the variation of Co2 +  at B-site and the decreasing particle size.