Magnetic Properties of γ-Fe_2O_3 Nanopowder Synthesized by Atmospheric Microwave Torch Discharge

• Authors: B. David , O. Schneeweiss , E. Šantavá , O. Jašek
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

52.50.Sw; 81.07.Wx; 76.80.+y

Discipline

• 81.07.Wx: Nanopowders
• 52.50.Sw: Plasma heating by microwaves; ECR, LH, collisional heating
• 76.80.+y: Mössbauer effect; other γ-ray spectroscopy(see also 33.45.+x Mössbauer spectra—in atomic and molecular physics; for biophysical applications, see 87.64.kx; for chemical analysis applications, see 82.80.Ej)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 122
• Issue: 1
• Pages: 9-11

Dates

published

2012-07

Contributors

author

B. David

• CEITEC IPM, Institute of Physics of Materials, AS CR, v.v.i., Žižkova 22, 61662 Brno, Czech Republic

author

O. Schneeweiss

• CEITEC IPM, Institute of Physics of Materials, AS CR, v.v.i., Žižkova 22, 61662 Brno, Czech Republic

author

E. Šantavá

• Institute of Physics, AS CR, v.v.i., Na Slovance 2, 18221 Praha 8, Czech Republic

author

O. Jašek

• Department of Physical Electronics, Faculty of Science, Masaryk University Kotlářská 2, 61137 Brno, Czech Republic

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Identifiers

DOI

10.12693/APhysPolA.122.9