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변태봉,이재영,김대영,손진군,권순주,Byeon, T.B.,Lee, J.Y.,Kim, D.Y.,Shon, J.G.,Kwon, S.J. 한국세라믹학회 1991 한국세라믹학회지 Vol.28 No.2
$\gamma$-FeOOH suitable for magnetic recording media was synthesized using waste acid which is the by-product of the iron works factory. Effects of concentration of the acid and alkali and reaction temperature on the particle properties of $\gamma$-FeOOH and magnetic properties of $\gamma$-$Fe_2O_3$ were studied. $\gamma$-FeOOH single phase was formed below 1M of acid concentration with 1M of alkali concentration and at 0.4M of acid concentration with 4M of alkali concentration. While the width of acicular particle was increased, the length of acicular particle was decreased with diluting acid concentration. The magnetic properties of the $\gamma$-$Fe_2O_3$ improved with increasing acid concentration. $\gamma$-FeOOH single phase was formed in the temperature range of 30 to $80^{\circ}C$. The length of the particle was decreased with increasing temperature. $\gamma$-Fe2O3 produced from dehydration of $\gamma$-FeOOH showed bad magnetic properties due to the presence of many pores in the particle. But with successive reduction and oxidation of $\gamma$-$Fe_2O_3$ produced from dehydration of $\gamma$-FeOOH, $\gamma$-$Fe_2O_3$ showed good magnetic properties.
코발트 훼라이트 에피탁시얼 산화철의 생성과 자기특성(Ⅰ)
변태봉(T. B. Byeon),김대영(D. Y. Kim),이재영(J. Y. Lee),손진군(J. G. Shon) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.1
To improve the coercivity of γ-Fe₂O₃ particles. We have made cobalt ferrite epitaxial γ-Fe₂O₃ particles by crystallizing cobalt ferrite on the surface of γ-Fe₂O₃ particles. The coercivity of Co_xFe_(3-x)O₄ which is conform to coating layer showed the most superior characteristic when the value of x was 1. On the formation of cobalt epitaxial γ-Fe₂O₃ particles, controlling reaction atmosphere as oxidation atmosphere after non-oxidation atmosphere was the optimum condition to prepare cobalt epitaxial γ-Fe₂O₃ particles with superior magnetic properties. Epitaxial growth of cobalt ferrite on the surface of γ-Fe₂O₃ particles was accomplished at 90℃ for 30 minutes.
코발트 페라이트 에피탁시얼 γ-Fe2O3 의 합성 및 자기특성
이재영,변태봉,김대영,손진군 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.4
Acicular γ-Fe₂O₃ particles were heated at 90℃ in alkaline solution containing Co^(+2) and Fe^(+2). The coercivity of resultant product increased from 0.2 to 0.25, Co^(+2)/Fe^(+2) molar ratio, and gradually decreased above 0.25. When cobalt content is increased, the coercivity of resultant product increased linearly. The increase of coercivity was attributed to the crystalline magnetic anisotropy of the cobalt ferrite which is conform to coating layer. The coercivity increased with the increasing seed content. The stability of temperature and the change on standing was largely influenced by the composition of coating layer and showed the most superior properties in the range of the Co^(+2)/Fe^(+2) molar ratio of 0.36∼0.5.