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Atmospheric-pressure microwave torch discharge generated gamma-Fe2O3 nanopowder

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DAVID Bohumil SCHNEEWEISS Oldřich PIZÚROVÁ Naděžda ŠANTAVÁ Eva KUDRLE Vít SYNEK Petr JAŠEK Ondřej

Druh Článek ve sborníku
Konference 10TH INTERNATIONAL CONFERENCE ON SOLID STATE CHEMISTRY
Fakulta / Pracoviště MU

Přírodovědecká fakulta Fakulta informatiky Středoevropský technologický institut

Citace
WWW http://www.sciencedirect.com/science/journal/18753892/44
Doi http://dx.doi.org/10.1016/j.phpro.2013.04.025
Obor Fyzika plazmatu a výboje v plynech
Klíčová slova Microwave discharge; maghemite; Mossbauer spectroscopy; magnetic measurements
Přiložené soubory
Popis Microwave torch discharge ignited in Ar at 1 bar was used for the synthesis of gamma-Fe2O3 nanoparticles. A double-walled nozzle electrode enabled to introduce gases separately: Ar flowed in the central channel, whereas the mixture of H-2/O-2/Fe(CO)(5) was added into the torch discharge through an outer channel. The composition and properties of the synthesized nanopowders were studied by TEM, XRD, Raman and Mossbauer spectroscopies. Basic magnetic measurements at low/high temperatures were performed. The gamma-Fe2O3 phase with the mean crystallite size of 24 nm was identified by XRD in the representative sample. The measured Raman spectrum matched well those reported for gamma-Fe2O3 powders in the literature. In the transmission Mossbauer spectrum measured at 5 K the two sextets characteristic for gamma-Fe2O3 were clearly identified. No change in specific magnetic moment typical of Fe3O4 at its Verwey temperature was observed on the zero field curve, which smoothly increased with temperature. Neither Fe3O4 nor alpha-Fe2O3 were present in the sample. We also report on the high-temperature magnetic properties of the representative sample and describe its structural changes and phase transformations up to 1073 K.
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