Abstract
The electromagnetic wave absorption properties were investigated in the Co–Ti substituted Ba M-type hexagonal ferrites (BaFe 9.5(Co 1− y Ti y ) 2.5O 19 ( y = 0.4 – 0.8 )), which were prepared by a modified coprecipitation method. This modified chemical coprecipitation method was the combination of coprecipitation and synthesis from a salt melt. The Ba 9.5(Co 0.4Ti 0.6) 2.5O 19 sample, which was sintered at 1423 K for 5 h with a Bi 2O 3 addition of 2 wt%, exhibited high permeability ( μ r max ″ = 25 and μ r ″ at 1 GHz = 10 ). This sample also showed a good microwave absorption property (reflection loss: RL<−20 dB) with a small matching thickness ( d m) of 3.1 mm at 0.65 GHz. It is concluded that the Ba M-type ferrite prepared by the modified coprecipitation method has a possibility to become a candidate for thinner microwave absorbers in the gigahertz range.
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