Iron nanoparticles were prepared by chemical vapor condensation (CVC) using
iron pentacarbonyl, Fe(CO)5, as a precursor under inert Ar and He atmospheres in a flow
reactor. Subsequently, the produced nanoparticles were heat-treated at different temperatures
in air. The processes of the particle morphology and phase composition changes were studied.
It was found that under the continuous thermal treatment the iron nanopowders were
continuously transformed from oxide-coated iron via void magnetite to large hematite
nanoparticles. It was shown that low temperature heat-treatment allowed to improve magnetic
properties of the oxide-coated iron nanoparticles.
Keywords: iron nanoparticles; thermal treatment; magnetic properties
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