Abstract
The particle size distributions of cobalt powders prepared by reactive deposition were examined and correlated with the deposition condition. In reactive deposition, a Co(OH)2 colloid layer was formed at the electrode surface upon reduction of dissolved oxygen. The colloid layer accelerated the decrease in interfacial Co2+ concentration and inhibited crystal growth of the metal, and was therefore instrumental in the formation of fine cobalt particles. The powders from reactive deposition were statistically a factor of two finer and of more uniform size distribution than those from normal electrodeposition. It was found that both the reactive deposition of cobalt powders and the reactive deposition of porous cobalt structures were driven by the same kinetic factors, namely the requirement of maintaining an effective presence of the Co(OH)2 colloid layer at the electrode surface. Hence a similar dependence on deposition conditions for both processes was obtained.
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References
The Cobalt Development Institute (CDI), Cobalt News 89(2) (London 1989) 2.
C. Q. Cui and A. C. C. Tseung, J. Mater. Sci. 28 (1993) 461.
S. P. Jiang, C. Q. Cui and A. C. C. Tseung, J. Electrochem. Soc. 138 (1991) 3599.
C. Q. Cui, S. P. Jiang and A. C. C. Tseung, ibid. 139 (1992) 60.
C. Q. Cui, S. P. Jiang and A. C. C. Tseung, ibid. 1276.
C. Q. Cui, S. P. Jiang and A. C. C. Tseung, ibid. 1535.
S. P. Jiang, Y. Z. Chen, J. K. You, T. X. Chen and A. C. C. Tseung, ibid. 137 (1990) 3374.
N. Ibl, in “Advances in Electrochemistry and Electrochemical Engineering”, Vol. 2, edited by C. W. Tobias (Wiley, New York, 1962) p. 49.
M. Miyata, K. Kobayashi, H. Wakayama, T. Miyabayashi, M. Yasuda and F. Hine, Surf. Tech. 40 (1989) 472 (in Japanese).
C. Q. Cui, S. P. Jiang and A. C. C. Tseung, J. Electrochem. Soc. 137 (1990) 3148.
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Cui, C.Q., Lee, J.Y. & Tan, T.C. Reactive deposition of ultrafine cobalt powders. JOURNAL OF MATERIALS SCIENCE 29, 6495–6500 (1994). https://doi.org/10.1007/BF00354010
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DOI: https://doi.org/10.1007/BF00354010