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.
Related projects:	Synthesis of Fe-based magnetic nanoparticles in low-temperature microwave plasma Plazmochemické procesy a jejich technologické aplikace CEITEC - Central European Institute of Technology