The effect of V2O5 on high-frequency properties for W-type barium ferrite composites Z.W. Li, Y. P.Wu and G. Q. Lin Temasek laboratories, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260 Tao Liu Singapore Synchrotron Light Sourc

Ferrite/polymer composites were prepared by mixing ferrite powders with epoxy resin. The powders are W-type barium ferrites BaCo_xZn_2-xFe₁₆O₂₇ (x=1.0, 1.3 and 1.5) doped with V₂O₅ of 0-1.5 wt%. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), extended X-ray absorption fine structure spectroscopy (EXAFS), scanning electron microscope (SEM), electric resistivity, static and high-frequency magnetic measurements were performed to study the microstructure, static and high-frequency properties of the composites. The experimental results show that the doping of V₂O₅ can effectively modify the shape of particles, greatly decrease the value of real permittivity, and significantly enhance the complex permeability. The composites, therefore, are potential candidates for EM attenuation materials with low reflectivity and broad bandwidth.