Size Dependent Allotropic Transition of Co Fine Particles

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Abstract:

In order to investigate the size dependent allotropic transition of Co in wide size range, nanometer scaled (9 nm–350 nm) and micrometer sized (1 m–18 m) Co particles were prepared by laser induced pyrolysis, reduction as well as high temperature annealing treatment. In wide size range, from 9 nm to 10 m for example, the crystal structure of the Co particles is dependent on their thermal history in which the particle involved in preparation or in annealing treatment. Only when the particle size is very large, much greater than 10 m for example, the fcc-hcp transformation could occur during the cooling from high temperautre. According to the effect of surface energy on the martensitic transformation, the size dependent allotropic transformation of Co was discussed.

Keywords: ALLOTROPIC TRANSITION; CO; PARTICLES; SURFACE ENERGY

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2009.M79

Publication date: July 1, 2009

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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