Thermal history dependence of the crystal structure of Co fine particles

Details Thermal history dependence of the crystal structure of Co fine particles Thermal history dependence of the crystal structure of Co fine particles

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrvb..71b4106z&link_type=abstract

Physical Review B, vol. 71, Issue 2, id. 024106

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Martensitic Transformations, Nanocrystals And Nanoparticles, Laser Applications

Scientific paper

hcp and fcc Co fine nanoparticles with different size have been synthesized by low-temperature laser pyrolysis and by reduction at different temperatures from 200 °C to 550 °C of cobalt-oxide nanoparticles prepared by the same method. The influence of thermal treatment on the crystal structure of Co particles was examined. It was found that below 420 °C , only hcp Co phase particles were obtained by laser pyrolysis or by reduction. Medium temperature (around 420 °C ) resulted in a mixture of hcp and fcc phases. Only when high temperatures, above 500 °C , were involved during the synthesis or annealing of Co particles, did the fcc particles form and maintain their structure to ambient temperature, without structural change of fcc-hcp. In view of the size effect on the phase transformation kinetics, the stabilization of fcc Co particles was explained.

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