Magnetic Properties of gamma-Fe2O3 Nanopowder Synthesized by Atmospheric Microwave Torch Discharge

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Authors

DAVID B. SCHNEEWEISS O. SANTAVA E. JAŠEK Ondřej

Year of publication 2012
Type Article in Proceedings
Conference Proceedings of the European Conference Physics of Magnetism 2011 (PM’11)
MU Faculty or unit

Faculty of Science

Citation
Web http://przyrbwn.icm.edu.pl/APP/PDF/122/a122z1p03.pdf
Keywords gamma-Fe2O3
Description 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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