Influence of Co content on the characterization and magnetic properties of magnetite

Preparation of nanosized CoxFe3−xO4; 0.05 ≤ x ≤ 0.20 particles from metal nitrates solution through citrate–precursor method was performed. XRD pattern of all prepared systems showed single phase with cubic spinel structure. The crystallite size was determined from TEM and found to agree with that calculated from Sherrerʹs equation (60–76 nm) The magnetic constants such as molar magnetic susceptibility (χM), Curie temperature (TC) and saturation magnetization (MS) were measured and the results indicated that, at x = 0.2 the values of χM, MS, remanent magnetization (Mr,) and coercive field (Hc) are 23 emu/g mol, 77.62 emu/g, 33.17 emu/g and 574.5 Oe, respectively.