Electromagnetic wave absorption properties of Co-Ti substituted Ba M-type ferrite produced by a modified chemical coprecipitation

Kazuaki Haga, Satoshi Sugimoto, Toshio Kagotani, Koichiro Inomata

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

In this paper, the electromagnetic wave absorption properties of Co-Ti substituted Ba M-type hexagonal ferrite (BaFe9.5(Co 1-yTiyO19 (y = 0.4 - 0.8)) produced by a modified coprecipitation method were investigated. This modified chemical coprecipitation method was the combination of the coprecipitation and the synthesis from a salt melt. The sample, Ba9.5(Co0.5Ti 0.5)2.5O19 sintered at 1423 K for 5h, whose powder was produced by the modified coprecipitation method, exhibited high permeability (μ″r max = 11) and reflection loss (R.L.) around -10 dB at a relatively wide frequency range (0.8 - 9 GHz) comparable to the Ultra Wide Band (UWB). In order to enhance the sintering, the addition of Bi2O3 was carried out. The Ba9.5(Co 0.4Ti0.6)2.5O19 sample sintered at 1423 K for 5 h with a Bi2O3 content of 2 mass%, exhibited high permeability (″μr max = 25 and ″μ r at 1 GHz = 10). This sample also showed good microwave absorption properties (reflection loss: R.L. < -20dB) with a small matching thickness (dm) of 3.1 mm at 0.65 GHz and f · d product (f · d) of 2.0GHz·mm. It can be said that the Ba M-type ferrite produced by the modified coprecipitation method has a possibility to become a material for the thinner microwave absorber in the several GHz range.

Original languageEnglish
Pages (from-to)2606-2609
Number of pages4
JournalMaterials Transactions
Volume45
Issue number8
DOIs
Publication statusPublished - 2004 Aug

Keywords

  • Barium ferrite
  • Cobalt-titanium substitute
  • Electromagnetic absorber
  • Magnetoplumbite type
  • Matching frequency
  • Matching thickness
  • Natural resonance
  • Reflection loss
  • Ultra wide band

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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