Low-Loss Co₂-Y Ferrites with Added CuO Sintered in Air for High Frequency Application

Shigeo Fujii, Koji Wakamatsu, Hiroshi Satoh, Setsuo Yamamoto

Department of Material Science and Engineering, University of Yamaguchi, Ube, Japan.

DOI: 10.4236/msa.2014.513099                

Abstract

The sintering characteristics of hexagonal Co₂-Y-type ferrite, Ba₂Co₂Fe₁₂O₂₂, with the addition of 0.6 wt% CuO, were studied in order to allow for preparation in air, as opposed to the conventionally recommended O₂, for industrial production. The dependence of the resistivity, ρ magnetic loss, tanδ, and the permeability, μ, at 1 GHz on the sintering temperature was investigated. A low tanδ of 0.05 with a m of 2.7 at a frequency of 1 GHz, along with a high ρ (up to 7 × 10⁴ μm), were attained under sintering at 1170°C in air, which were the same features as those of samples sintered at 1200°C in O₂. The dependence of tanδ on grain diameter was also examined, and it was determined that a small grain size (less than 2 μm) is preferable for low tanδ.

Keywords

Ferrite, Hexagonal, Y-Type, Sintering, Low Loss

Conflicts of Interest

The authors declare no conflicts of interest.

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