Size Dependent Allotropic Transition of Co Fine Particles
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 μm–18 μm) 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 μm 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 μm 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.
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Document Type: Research Article
Publication date: 2009-07-01
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