Microwave absorption properties of Ba M-type ferrite prepared by a modified coprecipitation method

Satoshi Sugimoto, Kazuaki Haga, Toshio Kagotani, Koichiro Inomata

Research output: Contribution to journalArticlepeer-review

94 Citations (Scopus)

Abstract

The electromagnetic wave absorption properties were investigated in the Co-Ti substituted Ba M-type hexagonal ferrites (BaFe9.5(Co 1-yTiy)2.5O19 (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 Ba9.5(Co0.4Ti 0.6)2.5O19 sample, which was sintered at 1423 K for 5 h with a Bi2O3 addition of 2 wt%, exhibited high permeability (μrmax″=25 and μr″ at 1GHz=10). This sample also showed a good microwave absorption property (reflection loss: RL<-20 dB) with a small matching thickness (dm) 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.

Original languageEnglish
Pages (from-to)1188-1191
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume290-291 PART 2
DOIs
Publication statusPublished - 2005 Apr

Keywords

  • Coprecipitation
  • M-type ferrite
  • Microwave absorber
  • Permeability
  • Reflection loss

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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