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A study on the Ni formation by reduction of NiO nano crystals  

Kim, Chang-Sam (Korea Institute of Science and Technology)
Kang, Seung-Min (Department of Advanced Materials Science and Engineering, Hanseo University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.19, no.5, 2009 , pp. 246-250 More about this Journal
Abstract
The Ni formation behavior from the reduction of NiO nano crystals in the $H_2/N_2$ gas mixtures. The NiO nano crystals were synthesized by heat-treating nickel nitrate$(Ni(NO_3)_2\cdot6H_O)$ in the air at $500^{\circ}C$, and had an octahedral shape and the particle size of 200~500 nm. The NiO nano-crystals had well-developed (111) planes which is hardly formed in normal synthetic conditions. The reduction process was carried out at 300 and $600^{\circ}C$ for 15 and 60 minutes, respectively. When the NiO nano-crystals were reduced at $300^{\circ}C$, the Ni particles sustained the same octahedral shape as NiO, while Ni particles were to agglomerate at $600^{\circ}C$.
Keywords
NiO nano-crystals; Ni particles; Reduction; Particle shape; Growth behavior;
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