In this paper, plate-like Co2W ferrite was synthesized by the molten salt/coprecipitation method using chlorate as the raw material. The plate-like Co2W sample exhibiting the best performance was obtained by heating to 1200 °C for 2 h. The effects of the synthesis temperature (1100–1250 °C) and soaking time (0.5–3 h) on the structure, microstructure, absorption properties and electromagnetic parameters of ferrite powders were investigated by XRD, SEM, EDS, XRF, VSM and VNA. The thermal analysis of the precursor was investigated by XRD and TG–DSC. The maximum saturation magnetization of Co2W ferrite prepared at 1200 °C for 2 h was 75 emu/g, and the maximum magnetic loss at 0.50 GHz was 0.55. The coercivity was inversely proportional to soaking time and preparation temperature.
