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2012 | 122 | 1 | 9-11
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Magnetic Properties of γ-Fe_2O_3 Nanopowder Synthesized by Atmospheric Microwave Torch Discharge

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A nanopowder containing γ-Fe_2O_3 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 γ-Fe_2O_3 phase was confirmed by powder X-ray diffraction (mean crystallite size d_{XRD}=24 nm). The dominating characteristic sextets of γ-Fe_2O_3 were identified in the Mössbauer spectrum taken at 5 K. The presence of pure Fe_3O_4 in the nanopowder was excluded. The Mössbauer spectrum taken at 5 K exhibited six times larger total spectrum area than the Mössbauer 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.
  • CEITEC IPM, Institute of Physics of Materials, AS CR, v.v.i., Žižkova 22, 61662 Brno, Czech Republic
  • CEITEC IPM, Institute of Physics of Materials, AS CR, v.v.i., Žižkova 22, 61662 Brno, Czech Republic
  • Institute of Physics, AS CR, v.v.i., Na Slovance 2, 18221 Praha 8, Czech Republic
  • Department of Physical Electronics, Faculty of Science, Masaryk University Kotlářská 2, 61137 Brno, Czech Republic
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