Abstract
The Zn2+ and Zr4+-doped barium hexaferrite according to the stoichiometric formation BaFe(12-(2x /3))ZnxO19 and BaFe(12-(4x /3))ZrxO19 with x = 0, 0.1, 0.3 and 0.5 were prepared by conventional method using ball milling technique. These powders were calcined at various temperatures from 1000 °C to 1200 °C for 2 h. The structural, morphology and magnetic properties were carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM), respectively. The XRD confirmed the formation of main phase magneplumbite and the crystalline structure of samples is still hexagonal. Pure and dopes barium hexaferrite shows only single phase. The lattice parameter a and c increased with the Zn2+ and Zr4+ ion content increasing. The SEM results showed that the particles of pure BaFe12O19 were regular hexagonal while doped-samples showed spherical shape. After Fe3+ is partly substituted with Zn2+, the magnetic parameters like coercivity and saturation magnetization are decreased. On the other hand, with increasing Zr4+ ions, the coercive force and saturation magnetization are slightly increased. The behavior of magnetic properties of materials is explained by the combined effect of the coherent rotation of the magnetic domains and the replacements of Fe3+ by Zn2+ and Zr4+ ions in the tetrahedral and octahedral sites.
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