TITLE:
Low-Loss Co2-Y Ferrites with Added CuO Sintered in Air for High Frequency Application
AUTHORS:
Shigeo Fujii, Koji Wakamatsu, Hiroshi Satoh, Setsuo Yamamoto
KEYWORDS:
Ferrite, Hexagonal, Y-Type, Sintering, Low Loss
JOURNAL NAME:
Materials Sciences and Applications,
Vol.5 No.13,
November
28,
2014
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.