| Hexagonal Ferrite에 관한 연구 (IV) -혼합수산화물로부터 각종 Hexagonal Ferrite 의 생성과정에 관한 연구- |
| 김태옥 |
| 부산대학교 공과대학 |
| Studies on the Hexagonal Ferrite(IV) -The Formation Process of the Hexagonal Ferrites During Calcining the Mixture of $Ba(OH)_2$, $Zn(OH)_2$ and $6Fe(OH)_3$- |
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| ABSTRACT |
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In order to obtain the fundamental data for the preparation of ferroxplana $Zn_2Y(Ba_2Zn_2Fe_{12}O_{22})$, which is useful for GHz-band communication, the optimum coprecipitation condition of $Zn(NO_3)_2-6FeCl_3$ in $NH_4OH$ solution and the formation process of the hexagonal ferrite were investigated. By the hot-petroleum-drying and calcining the coprecipitated hydroxide mixture $Zn(OH)_2 +Ba(OH)_2+ 6Fe(OH)_3$, the fine and uniform powder was obtained , whose phase composition and microstructure were studied by X.R.D. and electron microscope. In results, it was found that $Zn_2Y$, BaM and $Zn_2W$ were the representative phases in calcined specimens whose activation energies of crystal growth were about 3, 8, 2.5, $5.4{times}10^4$ J/mole , respectively. The sintered specimens would be appreciated as useful magnetic cores for the high frequency communication. |
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