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 sal gel process. Pure plate-like W-type barium ferrite with large size about 25 gm and high aspect ratio (diameter/thickness) of similar to 35 was obtained at a sintering temperature of 1200 degrees C. Morphology, phase evolution and static properties of the samples sintered at different temperatures (800-1200 degrees 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 M, increased with increasing sintering temperature, whereas the coercivity H decreased. Silicon resin composites filled with 45 vol% of the plate-like BaCoZnFe16O27 particles sintered at 1200 degrees C exhibited promising microwave attenuation properties. (C) 2014 Elsevier B.V. All rights reserved.