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J. Korean Ceram. Soc. > Volume 34(10); 1997 > Article
Journal of the Korean Ceramic Society 1997;34(10): 1074.
NiZn 페라이트의 저온 소결 특성에 관한 연구
고상기, 김병호1, 김경용
한국과학기술연구원 세라믹스 공정 연구센터
1고려대학교 재료공학과
A Study on Properties of Low Temperature Sintering in the NiZn Ferrite System
Microstructure and permeability as a function of sintering temperature and composition were studied on the Ni$delta$Cu0.4-$delta$Zn0.6Fe2O4 ($delta$=0, 0.1, 0.2, 0.3, 0.4) which was prepared by Cu2+ substitution for Ni2+ in Ni.0.4Zn0.6Fe2O4, then followed by 8 wt% CuO and 1wt% Bi2O3 as sintering aids. It was found that NiCuZn ferrite in which Cu2+ is substituted for Ni2+ is more effective in reduction of sintering temperature than Ni.0.4Zn0.6Fe2O4, containing CuO as a sintering aid. The specimen $delta$=0.2 sintered at 90$0^{circ}C$ for 2hr exhibited the highest initial permeability value ($mu$o=280 at 1Mhz), but the real permeability decreased at the frequency under 10 MHz. EPMA analysis showed that Ni$delta$Cu0.4-$delta$Zn0.6Fe2O4 ($delta$=0.4), sintered at 95$0^{circ}C$ for 2hrs consisted of three phase regions of Ni.0.3Cu0.1Zn0.6Fe2O4 region, Cu and Bi liquid existed at the 3-point boundary, although the stabilization energy of Ni2+ is higher than that of Cu2+ in B site.
Key words: NiZn Ferrite, Permeability, Stabilization energy of B site
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