Influence of Heat-treatment Temperature on Microwave Absorbing Properities of Ni-Zn Ferrite

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J. Korean Ceram. Soc. > Volume 29(3); 1992 > Article

Journal of the Korean Ceramic Society 1992;29(3): 177.

Zi-Zn Ferrite의 전파흡수특성에 미치는 열처리온도의 영향

조성백, 권경일, 최경구, 김성수, 김재묵

국방과학연구소

Influence of Heat-treatment Temperature on Microwave Absorbing Properities of Ni-Zn Ferrite

ABSTRACT

The effect of heat-treatment temperature on the microwave absorbing properties was investigated in Ni0.8Zn0.2Fe2O4 specimens. The composite specimens were prepared by modling and curing the mixture of prereacted ferrite powder and silicone rubber. The measurement of complex permeability and permittivity was made by the reflection/transmission method. The most sensitive material constants with heat-treatment temperature is the imaginary (loss) component of permeability. The higher the heat-treatment temperature, the greater the magnetic loss. The composite specimens with high magnetic loss exhibited superior microwave absorbing properties. The quantitative estimation of microwave absorbing properties were made by plotting the observed material constants on the calculated solution map of impedance-matching.