Abstract
Magnesioferrite (MgFe2O4) powder was prepared through the ceramic route by calcination of a stoichiometric mixture of magnesium oxide and iron oxide. The produced powders of MgFe2O4 were isothermally reduced in pure hydrogen at 800–1000°C. Based on thermogravimetric analysis, the reduction behaviour of magnesioferrite and the kinetics reaction mechanism were studied. The initial ferrite powder and the various reduction products were characterised by X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM) analysis to reveal the effect of hydrogen reduction on composition, microstructure and magnetic properties of produced samples. Completely homogenous nanocrystalline (77 nm) Fe/MgO composite was obtained by the reduction of MgFe2O4 powders. Depending on the kinetics obtained data from reduction process, the reduction rate was found to be controlled by interfacial chemical reaction mechanism. The magnetic characterisation of the formed Fe/MgO nanocomposite were enhanced under the effect of reaction temperature whereas the coercivity values decreased from 57·99 to 33·58 Oe while the saturation magnetisation increased from 110·7 to 148·1 emu g−1.
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