Abstract
In our efforts to investigate the correlation between the distribution of cations over five crystallographic positions and magnetic properties of Ba-hexaferrites in the coupled substitution of magnetic Co2+ and non-magnetic Zr4+ for Fe3+ by urea assisted citrate precursor route. During present research, the polycrystalline samples of series of BaCoxZrxFe(12−2x)O19 (x=0.0–1.0) ferrites have been prepared with aim to study the magnetic properties including coercivity, remanance and magnetic saturation at room temperature. Urea and citrate were used as fuels in the presence of nitric acid. Single phase M-type hexagonal ferrites are formed at 800°C which is confirmed by Powder X-ray diffraction. The average size of hexagonal platelets is 39nm. BET surface area of sample is 34.86m2/g. Mössbauer studies suggest that dopant ions largely prefer 4f1 and 2a sites up to 0.8 level while substitution at 12k, 4f1 and 2a sites is indicated at higher concentrations. Magnetic data show that the coercive force is steeply reduced from 5017 to 589Oe with increasing Co–Zr contents but net magnetization is nearly constant (MS=50.38–63.54emu/g). High MS and low HC values of our materials make them particularly suitable for application in many electrical devices. Our results indicate that the distribution of dopants on the five sites lead to control magnetization and magnetocrystalline anisotropy.
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