Abstract
In the present study, BaFe12−2xZnxNbxO19 (x = 0. 2, 0.4, 0.6 and 0.8) hexaferrites were prepared by the sol- gel technique and subsequent thermal treatment. The crystal structure, grain size, and magnetic properties were studied by means of X-ray diffraction (XRD), high-resolution scan- ning electron microscope (HR-SEM) and vibrating sam- ple magnetometer (VSM). The X-ray diffraction analysis showed that the barium hexaferrite with small substitu- tions still maintained a hexagonal magneto-plumbite phase. It was found that the mean size of the grains increased with increasing substitution. The saturation magnetization increased slightly with increasing x, which was attributed to different preferential site occupation of Zn-Nb at low and high concentration ranges. The coercivity decreased with increasing x. Structural and magnetic characterizations of these ferrites provide significant information about their re- active physical properties.
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