Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Characteristics of the Barium Ferrite Produced by Hydrothermal Treatment

수열합성을 통해 제조된 Barium Ferrite 분말의 특성

Nam, Sung-Chan;Kim, Geon-Joong
남성찬;김건중

  • Published : 20040400
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Abstract

Barium ferrite was prepared from a mixed solution of $Ba(NO_3)_2,\;Fe(NO_3)_3{\cdot}9H_2O$ and KOH by the hydrolysis and dehydration through hydrothermal treatment. The characteristics of the barium ferrite, formed in the batch reactor were investigated thru varying the Fe/Ba molar ratio and reaction time in the respective range of $1{\sim}12\;and\;30{\sim}360$ min. Final product obtained was single-phase barium ferrite with a size of 0.3{\sim}1\;$\mu\textrm{m}$. The maximum saturation magnetization and coercivity of the obtained powder were about 51.36 emu/g and 1355 Oe, respectively. compared with the conventional hydrothermal synthesis method, the method using supercritical water remarkably reduced the reaction time for the synthesis of barium ferrite.

$Ba(NO_3)_2,\;Fe(NO_3)_3{\cdot}9H_2O$ 및 KOH 수용액을 사용하여 수열합성조건에서의 가수분해와 탈수반응을 통해 Barium ferrite를 합성하였다. 회분식 반응기를 이용하여 반응조건을 각각 Fe/ba 농도비는 1에서 12로 변화시켰으며, 반응시간은 30 min에서 360 min까지 변화시키면서 합성된 입자의 형태 및 조성과 자기특성에 대해서 고찰하였다. 생성된 입자는 단일상의 barium ferrite로 육각판상의 형태를 갖고 있으며, 입자의 크기는 $0.3{\sim}1\;\mu\textrm{m}$ 정도이다. 또한, 자기 특성은 최대 포화자화($\sigma_r$)와 보자력($H_c$)이 각각 51.36 emu/g와 1355 Oe를 가지는 barium ferrite분말을 얻을 수가 있었다. 초임계상태에서 제조된 barium ferrite는 일반적인 수열합성법으로 제조된 barium ferrite보다 빠른 시간에 안정적으로 단일상의 barium ferrite를 제조할 수 있었다.

Keywords

References

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