Effects of Bi2O3 doping on the mcrostructure and high-frequency magnetic properties of low-temperature sintered Co-Ti substituted barium ferrites

Co-Ti substituted barium ferrite powders were prepared by chemical coprecipitation, Effects of Bi2O3 doping and Co-Ti substitution amount on microstructures and high-frequency magnetic properties of low-temperature sintered barium ferrites were investigated with XRD, SEM, TEM and the measurements of complex permeability dispersions. The initial permeability can be promoted with Bi2O3 doping effectively. The proper amount of Bi2O3 doping was Zwt/'o when the diameter of magnetic particles was about 200nm. Larger diameter and more perfect surface morphology would result in higher permeabilities. Barium ferrites with initial permeability μ1 10. cut-off frequency lGHz were obtained when it was sintered at 900℃ with 2wt% Bi2O3 in the Co-Ti substitution range 1. 20-1. 30.