Iron-Based Nanopowders Containing $\alpha$-Fe, Fe3C, and $\gamma$-Fe Particles Synthesised in Microwave Torch Plasma and Investigated with Mössbauer Spectroscopy

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Two Fe-based nanopowders were synthesised using microwave torch discharge at 1 bar. The main channel of the discharge was operating in Ar, which flowed through the central nozzle of an electrode, whereas the reactive mixture H2/Fe(CO)5 was added through a concentric outer nozzle. Besides rarely observed $\gamma$-Fe particles (for the first sample: $d_{\text{XRD}} = 30$ nm, 35 wt %; for the second sample: $d_{\text{XRD}} = 9$ nm, 33 wt %) samples also included $\alpha$-Fe, Fe3C, and Fe3O4/$\gamma$-Fe2O3 particles. The presence of $\gamma$-Fe phase was proved by the interpretation of the XRD patterns and the Mössbauer spectra taken at 293 and 5 K.
2011-08-25