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α-Fe nanočástice připravené rozkladem pentakarbonylu železa v mikrovlnném výboji
David, Bohumil ; Pizúrová, Naděžda ; Schneeweiss, Oldřich ; Hoder, T. ; Kudrle, V. ; Janča, J.
The nanocrystalline iron powder has been prepared by the introducing of Fe(CO)5 vapor into the microwave induced argon discharge. A microwave 2.45 GHz source was operated at 430 W. The reaction was performed in a quartz tube passing through the microwave waveguide. The in-situ passivation using air was applied after synthesis. The powder was characterised by TEM, XRD, and Mössbauer spectroscopy. According to our TEM investigation, the produced passivated powder included aggregated core-shell nanoparticles. The cores consist of α-Fe and the shell is supposed to be iron oxide (indicated by TEM). The presence of α-Fe and iron oxides was confirmed by XRD and Mössbauer spectroscopy. The mean coherence domain size of α-Fe cores was estimated to be 30 nm. The synthesized nanopowder exhibits ferromagnetic behaviour.
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