Preparation and Microwave Absorbing Characteristics of Ni-Zn Ferrite Composite

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J. Korean Ceram. Soc. > Volume 29(7); 1992 > Article

Journal of the Korean Ceramic Society 1992;29(7): 505.

복합 Ni-Zn Ferrite의 제조 및 전파흡수특성

최경구, 오재희¹, 김성수, 김재묵

국방과학연구소
¹인하대학교 무기재료공학과

Preparation and Microwave Absorbing Characteristics of Ni-Zn Ferrite Composite

ABSTRACT

The influence of excess iron content (x) and reaction atmosphere on permittivity, permeability and microwave absorbing properties has been investigated in composite specimens embeded with (Ni0.4Zn0.6O)1-x(Fe2O3)1+x powders. A nitrogen atmosphere used for the reaction of the ferrite with excess iron composition (x>0) enhances spinel formation, and thereby increases both the magnetic and the dielectric loss of the ferrite composite. We also investigated the relation between the electromagnetic constants and the absorbing properites using impedance-matching solution maps for zero reflection. It is suggested that a superior microwave absorber can be fabricated through atmosphere and excess iron control during the powder process.