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Bohumil David, Nadezda Pizurova, Oldřich Schneeweiss, Vít Kudrle, Ondřej Jašek, Petr Synek

Iron-Based Nanopowders Containing alpha-Fe, Fe(3)C, and gamma-Fe Particles Synthesised in Microwave Torch Plasma and Investigated with Mossbauer Spectroscopy

Japanese Journal of Applied Physics 50 (2011) 000

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 H(2)/Fe(CO)(5) was added through a concentric outer nozzle. Besides rarely observed gamma-Fe particles (for the first sample: d(XRD) = 30 nm, 35 wt %; for the second sample: d(XRD) = 9 nm, 33wt %) samples also included alpha-Fe, Fe(3)C, and Fe(3)O(4)/gamma-Fe(2)O(3) particles. The presence of gamma-Fe phase was proved by the interpretation of the XRD patterns and the Mossbauer spectra taken at 293 and 5 K. (C) 2011 The Japan Society of Applied Physics

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