Researches on the Formation and Thermal Treatment of (Zn0.3Co0.7)2-W Type Ferrite

W-type hexagonal ferrite BaZn0.6Co1.4Fe16O27 was prepared by the method of coprecipitation with flux. Various products were prepared by different thermal treatments. The microstructure, element composition, crystal structure, phases and dynamic electromagnetic parameters of the products were analyzed by SEM, EDS, XRD and the microwave vector network analyzer. The formation of the ferrite was studied and the optimal thermal treatment condition was confirmed, under which pure tiny W-type hexagonal ferrite powders were achieved.