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Vol.40, No.6, 711 ~ 716, 2002
Title
Research Papers / Materials Processing : Microstructure and Magnetic Properties of Fe Nanoparticles Synthesized by Chemical Vapor Condensation
최철진Chul Jin Choi,김병기Byoung Kee Kim
Abstract
The Nano-sized Fe particles were successfully synthesized by Chemical Vapor Condensation (CVC) process using the precursor of iron pentacarbonyl (Fe(CO)_5) as a source. The influence of CVC parameters on the formation of nanoparticle, the microstructure and magnetic properties was studied. The synthesized nanoparticles consisted of the core-shell type structure with nearly spherical shape and 5-13 ㎚ in mean size. Average particle size increased with increasing the decomposition temperature. The size distribution became wider and asymetric with increase of particle size. The lattice parameter of metallic core increased with decreasing the particle size. This could be explained by the coherency relationship between the Fe core and Fe_3O_4 oxide shell. With change of particle size and core microstructure, the magnetic state of Fe nanoparticle was changed from ferromagnetism to superaparamagnetism.
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