Abstract
A series of powders of M-typed barium hexaferrites doped with Co, Zn and Sn of general formula BaFe12–2xCox/2Znx/2SnxO19 (x=0–2.0) were prepared by the co-precipitation/molten salt method. The structures, particle morphology and magnetic properties of the products were characterized by X-ray powder diffraction, vibrating sample magnetometer and ESEM/EDX. The results show that the crystallinity of the samples decreases with increase in the doping amount x. When x is less than 0.6, it is possible to obtain perfectly crystallized hexagonal BaFe12–2xCox/2Znx/2SnxO19, where the diameters of the particles are around 500nm. The saturation magnetization of pure barium ferrite BaFe12O19 produced with this method is 71.9Am2kg−1 at room temperature and the intrinsic coercivity (Hc) is 367.8kAm−1. The doped barium hexaferrite powder obtained when x is between 0.3 and 0.4 exhibits high saturation magnetization and a temperature dependence of coercivity close to zero.
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