About: Atmospheric-pressure microwave torch discharge generated γ-Fe2O3 nanopowder

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About: Atmospheric-pressure microwave torch discharge generated γ-Fe2O3 nanopowder Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Microwave torch discharge ignited in Ar at 1 bar was used for the synthesis of γ-Fe2O3 nanoparticles. A double-walled nozzle electrode enabled to introduce gases separately: Ar flowed in the central channel, whereas the mixture of H2/O2/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 Mössbauer spectroscopies. Basic magnetic measurements at low/high temperatures were performed. The γ-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 γ-Fe2O3 powders in the literature. In the transmission Mössbauer spectrum measured at 5 K the two sextets characteristic for γ 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 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. Microwave torch discharge ignited in Ar at 1 bar was used for the synthesis of γ-Fe2O3 nanoparticles. A double-walled nozzle electrode enabled to introduce gases separately: Ar flowed in the central channel, whereas the mixture of H2/O2/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 Mössbauer spectroscopies. Basic magnetic measurements at low/high temperatures were performed. The γ-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 γ-Fe2O3 powders in the literature. In the transmission Mössbauer spectrum measured at 5 K the two sextets characteristic for γ 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 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. (en)
Title	Atmospheric-pressure microwave torch discharge generated γ-Fe2O3 nanopowder Atmospheric-pressure microwave torch discharge generated γ-Fe2O3 nanopowder (en)
skos:prefLabel	Atmospheric-pressure microwave torch discharge generated γ-Fe2O3 nanopowder Atmospheric-pressure microwave torch discharge generated γ-Fe2O3 nanopowder (en)
skos:notation	RIV/68378271:_____/13:00421345!RIV14-AV0-68378271
http://linked.open...avai/predkladatel	Fyzikální ústav AV ČR, v.v.i.
http://linked.open...avai/riv/aktivita	I P Z
http://linked.open...avai/riv/aktivity	I, P(1M0512), P(ED1.1.00/02.0068), P(GA106/08/1440), P(GA202/08/0178), Z(AV0Z10100520)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Šantavá, Eva
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Fyzikální ústav AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	62446
http://linked.open...ai/riv/idVysledku	RIV/68378271:_____/13:00421345
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	maghemite; microwave discharge; Mossbauer spectroscopy; magnetic measurements (en)
http://linked.open.../riv/klicoveSlovo	maghemite microwave discharge Mossbauer spectroscopy magnetic measurements
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[26E3F6F42173]
http://linked.open...i/riv/nazevZdroje	Physics Procedia
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	7 (xsd:int)
http://linked.open...vavai/riv/projekt	Research center of powdered nanomaterials Iron and iron oxide nanoparticles with applications in the magnetic separation processes Synthesis of Fe-based magnetic nanoparticles in low-temperature microwave plasma Central european institute of technology
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	44
http://linked.open...iv/tvurceVysledku	David, Bohumil Schneeweiss, Oldřich Šantavá, Eva Jašek, O. Kudrle, V. Pizúrová, Naděžda Synek, P.
http://linked.open...n/vavai/riv/zamer	Specific effects in condensed systems with reduced dimension and broken symmetry
issn	1875-3892
number of pages	7 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.phpro.2013.04.025

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