Microstructure and magnetic properties of W-type hexagonal ferrites Ba1−xSrxFe2+2Fe3+16O27

A series of W-type hexagonal ferrites with the composition Ba1-xSrxFe22+Fe163+O27 (0≤x≤1) were prepared by the ceramic process in a reducing atmosphere during the whole process of pre-sintering and sintering. The phase composition, micro-morphology, and magnetic properties of the particles were investigated by XRD, SEM, and VSM. The results of XRD show that the single phase was observed in the W-type ferrites with different Sr content. The micro-morphology of the particles exhibits the uniform plane hexagonal structures of W-type ferrites with different Sr content. The coercivity (Hc) of the particles increases with the increase of Sr content (x), while the saturation magnetization (Ms) of the particles first decreases with x from 0 to 0.2, and then begins to increase when x continues to increase.