Iron-based nanopowders containing α-Fe, Fe(3)C, and γ-Fe particles synthesised in microwave torch plasma and investigated with Mössbauer spectroscopy

0369472 - ÚFM 2012 RIV JP eng J - Journal Article
David, Bohumil - Pizúrová, Naděžda - Schneeweiss, Oldřich - Kudrle, V. - Jašek, O. - Synek, P.
Iron-based nanopowders containing α-Fe, Fe(3)C, and γ-Fe particles synthesised in microwave torch plasma and investigated with Mössbauer spectroscopy.
Japanese Journal of Applied Physics. Roč. 50, 8 PART 2 (2011), 08JF11/1-08JF1/5. ISSN 0021-4922. E-ISSN 1347-4065
R&D Projects: GA ČR GA202/08/0178; GA MŠMT 1M0512
Institutional research plan: CEZ:AV0Z20410507
Keywords : nanoparticles * microvawe plasma * gamma-Fe * gamma-Fe4N * Mossbauer spectroscopy
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.058, year: 2011

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.
Permanent Link: http://hdl.handle.net/11104/0203526