Influence of Fe Content on Lattice, Structural and Magnetic Analyses of BaFe2+2Fe3+16-xO27± Hexaferrites Prepared by Facile Ceramic Route Methodology

Fe2W-type ferrite BaFe2+2Fe3+16-xO27± (x =−0.8, −0.4, 0.0, 0.4, 0.8, 1.2) fine powders and magnets were synthesized by a facile ceramic route. The lattice and microstructure of the fine powders were studied by x-ray diffraction (XRD). The results show that a single magnetoplumbite structure is obtained under the condition of Fe change (x =−0.8, −0.4, 0.0, 0.4, 0.8, 1.2). The morphology of the sintered magnet was studied by scanning electron microscopy (SEM). The influence of iron content on the magnetic characteristics of BaFe2+2Fe3+16-xO27± was systematically studied by controlling the pre-sintering temperature of 1300°C. The change in the remanence (Br) of BaFe22+Fe16-x3+O27± magnets with different iron content first increased and then decreased, which confirmed that the change trend of the Br was consistent with the variation in the saturation magnetization (Ms). Meanwhile, the coercivity (Hcj) and (Hcb) of the magnets was consistent with the change characteristics of the coercive force (Hc) of magnetic powder. At iron change (x) = −0.4, Ms, Br, Hc, Hcj, Hcb, and maximum energy product ((BH)max) reach maximum.