Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Formation Process of Barium Ferrite Crystallites in Molten Salts and its Magnetic properties

용융염내에서의 Ba-ferrite 결정의 생성과정 및 그 자기적 특성

  • 정지형 (부산대학교 무기재료공학과) ;
  • 김창곤 (부산대학교 무기재료공학과) ;
  • 윤석영 (부산대학교 무기재료공학과) ;
  • 신학기 (경남정보대학 식품화공학부) ;
  • 김태옥 (부산대학교 무기재료공학과)
  • Published : 2001.11.01
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Abstract

In this study, formation process of Ba-ferrite by using molten salt synthesis and its magnetic properties were investigated. Among starting materials, BaC $O_3$was only soluble in the molten salts, but other starting material such as $\delta$-FeOOH or F $e_2$ $O_3$was not soluble even at 105$0^{\circ}C$. It implies that the dissolved $Ba^{2+}$ diffused on surfaces of F $e_2$ $O_3$(or $\delta$-FeOOH), therefore, Ba-ferrtites were formed through surface reaction. However, the magnetic properties of Ba-ferrite prepared by two starting materials (F $e_2$ $O_3$and $\delta$-FeOOH) were not different. On the other hand, compared $\delta$-FeOOH with F $e_2$ $O_3$m, morphologies and dispersibility of Ba-ferrites prepared by using $\delta$-FeOOH were good and Ba-ferrites were obtaioned at lower temperature.

본 연구에서는 용융염법에 의한 Ba-ferrite의 생성기구와 그 자기적특성에 대해 조사하였다. 출발원료 중 BaC $O_3$만이 용융염내에서 용해도를 가졌으며, 이는 용융염내에서는 Ba-ferrite의 생성이 용해된 $Ba^{2+}$가 F $e_2$ $O_3$나 $\delta$-FeOOH의 표면으로 확산하여 표면반응을 통해 일어나는 것으로 보인다. 한편, 출발물질($\delta$-FeOOH와 F $e_2$ $O_3$)에 따라 생성된 Ba-ferrite가 합성되는 온도는 더 낮은 온도에서 생성됨을 알 수 있었다.

Keywords

References

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