Magnetic Properties of gamma-Fe2O3 Nanopowder Synthesized by Atmospheric Microwave Torch Discharge
| Autoři | |
|---|---|
| Rok publikování | 2012 |
| Druh | Článek ve sborníku |
| Konference | Proceedings of the European Conference Physics of Magnetism 2011 (PM’11) |
| Fakulta / Pracoviště MU | |
| Citace | |
| www | http://przyrbwn.icm.edu.pl/APP/PDF/122/a122z1p03.pdf |
| Klíčová slova | gamma-Fe2O3 |
| Popis | A nanopowder containing gamma-Fe2O3 particles was synthesized by adding a gas mixture of H-2/Fe(CO)(5) into a microwave torch discharge at 1 bar. The presence of gamma-Fe2O3 phase was confirmed by powder X-ray diffraction (mean crystallite size d(XRD) = 24 nm). The dominating characteristic sextets of gamma-Fe2O3 were identified in the Mossbauer spectrum taken at 5 K. The presence of pure Fe3O4 in the nanopowder was excluded. The Mossbauer spectrum taken at 5 K exhibited six times larger total spectrum area than the Mossbauer spectrum taken at 293 K. Zero field cooled/field cooled curves measured down to 4 K in the magnetic field of 7.9 kA/m are reported. |
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