Title:
MANGANESE-ZINC FERRITE
Document Type and Number:
WIPO Patent Application WO/1994/014723
Kind Code:
A1
Abstract:
The initial permeability of a manganese-zinc ferrite in the high-frequency zone of 10-500 Khz is improved by mixing a manganese-zinc ferrite comprising 50-56 mole % of Fe2O3, 22-39 mole % of Mno and 8-25 mole % of Zno with at most 800 ppm (in terms of Bi2O3) of bismuth oxide component and at most 1,200 ppm (in terms of MoO3) of molybdenum oxide component and firing the mixture. The mean crystal grain diameter is adjusted to 5-50 mum or less.
Inventors:
MATSUKAWA ATSUHITO (JP)
INOUE SHOJI (JP)
INOUE SHOJI (JP)
Application Number:
PCT/JP1993/001920
Publication Date:
July 07, 1994
Filing Date:
December 28, 1993
Export Citation:
Assignee:
TDK CORP (JP)
MATSUKAWA ATSUHITO (JP)
INOUE SHOJI (JP)
MATSUKAWA ATSUHITO (JP)
INOUE SHOJI (JP)
International Classes:
C04B35/26; C01G49/00; C04B35/38; H01F1/34; (IPC1-7): C04B35/38
Foreign References:
| JPH01168006A | 1989-07-03 | |||
| JPS6191908A | 1986-05-10 | |||
| JPS5845160A | 1983-03-16 |
Other References:
See also references of EP 0628524A4
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