Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Preparation of the Nano Cobalt Powder by Wet Chemical Reduction Method

액상환원공정을 이용한 나노 코발트 분말의 합성

  • Hong, Hyun-Seon (Plant Engineering Center, Institute for Advanced Engineering(IAE)) ;
  • Ko, Young-Dae (Plant Engineering Center, Institute for Advanced Engineering(IAE)) ;
  • Kang, Lee-Seung (Plant Engineering Center, Institute for Advanced Engineering(IAE)) ;
  • Kim, Geon-Hong (Plant Engineering Center, Institute for Advanced Engineering(IAE)) ;
  • Jung, Hang-Chul (Plant Engineering Center, Institute for Advanced Engineering(IAE))
  • 홍현선 (고등기술연구원 플랜트엔지니어링센터) ;
  • 고영대 (고등기술연구원 플랜트엔지니어링센터) ;
  • 강이승 (고등기술연구원 플랜트엔지니어링센터) ;
  • 김건홍 (고등기술연구원 플랜트엔지니어링센터) ;
  • 정항철 (고등기술연구원 플랜트엔지니어링센터)
  • Received : 2011.03.11
  • Accepted : 2011.04.27
  • Published : 2011.06.28
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Abstract

Spherical nanosized cobalt powder with an average size of 150-400 nm was successfully prepared at room temperature from cobalt sulfate heptahydrate ($CoSO_4{\cdot}7H_2O$). Wet chemical reduction method was adopted to synthesize nano cobalt powder and hypophosphorous acid ($H_3PO_2$) was used as reduction agent. Both the HCP and the FCC Co phase were developed while $CoSO_4{\cdot}7H_2O$ concentration ranged from 0.7 M to 1.1 M. Secondary phase such as $Co(OH)_2$ and $CO_3O_4$ were also observed. Peaks for the crystalline Co phase having HCP and FCC structure crystallized as increasing the concentration of $H_3PO_2$, indicating that the amount of reduction agent was enough to reduce $Co(OH)_2$. Consequently, a homogeneous Co phase could be developed without second phase when the $H_3PO_2/CoSO_4{\cdot}7H_2O$ ratio exceeded 7.

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