Magnetic Properties of γ-Fe2O3 Nanopowder Synthesized by Atmospheric Microwave Torch Discharge |
| B. Davida, O. Schneeweissa, E. Šantaváb and O. Jašek c
aCEITEC IPM, Institute of Physics of Materials, AS CR, v.v.i., Žižkova 22, 61662 Brno, Czech Republic bInstitute of Physics, AS CR, v.v.i., Na Slovance 2, 18221 Praha 8, Czech Republic cDepartment of Physical Electronics, Faculty of Science, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic |
| Full Text PDF |
| A nanopowder containing γ-Fe2O3 particles was synthesized by adding a gas mixture of H2/Fe(CO)5 into a microwave torch discharge at 1 bar. The presence of γ-Fe2O3 phase was confirmed by powder X-ray diffraction (mean crystallite size dXRD=24 nm). The dominating characteristic sextets of γ-Fe2O3 were identified in the Mössbauer spectrum taken at 5 K. The presence of pure Fe3O4 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. |
| DOI: 10.12693/APhysPolA.122.9 Erratum DOI: 10.12693/APhysPolA.129.8 PACS numbers: 52.50.Sw, 81.07.Wx, 76.80.+y |