Plasma synthesis, Mössbauer spectroscopy and X-ray diffraction studies of nanosized iron oxides

Abstract

In this article synthesis and study of iron oxide nanopowders are described. The synthesis of sample 1 and sample 2-iron oxides-was carried out by electric arc plasma cutting of ordinary steel. The sample 3 was prepared by evaporation of Fe 2 O 3 /FeO mixture in radio-frequency nitrogen plasma. The characterization of the as prepared iron oxide nanoproducts was achieved by means of Mössbauer spectroscopy and X-ray diffraction analysis. The presence of different phases of iron oxide with a basic phase Fe 3−x O 4 (magnetite), additional Fe 1−x O (wüstite) and α or γ -Fe 2 O 3 (hematite or maghemite) with superparamagnetic particles for sample 1 and sample 2 and Fe 3−x O 4 (magnetite) for sample 3 is observed.

Size-controlled synthesis of superparamagnetic iron-oxide and iron-oxide/iron/carbon nanotube nanocomposites by supersonic plasma expansion technique

“…The particle size distribution for F3 was constructed from a TEM micrograph of the sample, by considering total 112 particles, as presented in figure 3. It had a narrow size distribution between 2-28 nm (standard deviation of 1.8), with an average size of 10 nm, and devoid of any large particles, which is impressive when compared with most of the other thermal plasma assisted synthesis experiments reported in the last decade [22,38,[47][48][49][50]. Pingyan Lei et al had reported the plasma-assisted synthesis of nanocrystalline iron-oxide with almost similar size distribution and a model mobility diameter of 8-9 nm.…”