Structural and magnetic properties of plate-like W-type barium ferrites synthesized with a combination method of molten salt and sol-gel

Plate-like W-type barium ferrites (BaCoZnFe16O27) were prepared by using a combined method of molten salt and a sol-gel process. Pure plate-like W-type barium ferrite with large size about 25 μm and high aspect ratio (diameter/thickness) of ∼35 was obtained at a sintering temperature of 1200 °C. Morphology, phase evolution and static properties of the samples sintered at different temperatures (800-1200 °C) and dynamic magnetic properties of their composites with silicon resin were investigated by using SEM, XRD, VSM and VNA. It was found that the saturation magnetization Ms increased with increasing sintering temperature, whereas the coercivity Hc decreased. Silicon resin composites filled with 45 vol% of the plate-like BaCoZnFe16O27 particles sintered at 1200 °C exhibited promising microwave attenuation properties.