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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2011.1
- 수록면
- 244 - 249 (6page)
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Spherical nanosized cobalt powder with an average size of 150-400 nm was successfully prepared at room temperature from cobalt sulfate heptahydrate (CoSO_4· 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_4·7H_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· 7H_2O ratio exceeded 7.
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참고문헌 (13)
참고문헌 신청
/ 2010 / Cobalt facts, Cobalt Supply & Demand 2009 / Cobalt Development Institute
A. M. Ibrahim / 2010 / / J. Alloys Compd 506 : 201 ~
C. Johans / 2008 / / Colloid Surf. A-Physicochem. Eng. Asp 330 : 14 ~
D. J. Kim / 2002 / / Mater. Res. Bull 37 : 2067 ~
F. F. Lange / 1989 / / J. Am. Ceram. Soc 72 : 3 ~
A. M. Ibrahim / 2010 / / J. Alloys Compd 506 : 201 ~
C. Johans / 2008 / / Colloid Surf. A-Physicochem. Eng. Asp 330 : 14 ~
D. J. Kim / 2002 / / Mater. Res. Bull 37 : 2067 ~
F. F. Lange / 1989 / / J. Am. Ceram. Soc 72 : 3 ~
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