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-xO_27± (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-xO_27± was systematically studied by controlling the pre-sintering temperature of 1300°C. The change in the remanence (B_r) of BaFe₂²⁺Fe_16-x³⁺O_27± magnets with different iron content first increased and then decreased, which confirmed that the change trend of the B_r was consistent with the variation in the saturation magnetization (M_s). Meanwhile, the coercivity (H_cj) and (H_cb) of the magnets was consistent with the change characteristics of the coercive force (H_c) of magnetic powder. At iron change (x) = −0.4, M_s, B_r, H_c, H_cj, H_cb, and maximum energy product ((BH)_max) reach maximum. [ABSTRACT FROM AUTHOR]