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http://dx.doi.org/10.3740/MRSK.2002.12.10.791

A Study on Physical Properties Of Co3O4-added Ni- Zn Ferrite at High Frequency  

Koh, Jae-Gui (Department of Physics, Soongsil University)
Publication Information
Korean Journal of Materials Research / v.12, no.10, 2002 , pp. 791-795 More about this Journal
Abstract
We studied the physical properties of $Co_3$$O_4$-added Ni-Zn ferrite which were sintered at 1050~110$0^{\circ}C$ for 2 hours. X-ray diffraction showed a spinel structure, and optical microscopy showed grain sizes of 5 to 10 $\mu\textrm{m}$. As the sintering temperature was increased from $1050^{\circ}C$ to $1070^{\circ}C$, the initial permeability and magnetic induction increased, and both of the loss factor and the coercive force decreased. The Curie temperatures were about $^234~245{\circ}C$ with added $Co_3$$O_4$. The initial permeability was 350 to 420 and maximum magnetic induction density and coercive force 4870G to 4980G and 0.15 Oe to 0.21 Oe, respectively which were similar to those of Ni-Zn ferrite synthesized in the conventional process. The frequency of specimen was in the range of 1MHz to 300MHz. In the plot of initial permeability vs. frequencies, a $180^{\circ}C$ rotation of the magnetic domain could be perceived in a broad band of microwave before and after the resonance frequency.
Keywords
Curie temperature; microstructure; initial permeability; sintering density; magnetic induction;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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