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Statements

Subject Item
n2:RIV%2F68378271%3A_____%2F13%3A00421345%21RIV14-AV0-68378271
rdf:type
n15:Vysledek skos:Concept
dcterms: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.
dcterms:title
Atmospheric-pressure microwave torch discharge generated γ-Fe2O3 nanopowder Atmospheric-pressure microwave torch discharge generated γ-Fe2O3 nanopowder
skos:prefLabel
Atmospheric-pressure microwave torch discharge generated γ-Fe2O3 nanopowder Atmospheric-pressure microwave torch discharge generated γ-Fe2O3 nanopowder
skos:notation
RIV/68378271:_____/13:00421345!RIV14-AV0-68378271
n15:predkladatel
n16:ico%3A68378271
n3:aktivita
n4:Z n4:I n4:P
n3:aktivity
I, P(1M0512), P(ED1.1.00/02.0068), P(GA106/08/1440), P(GA202/08/0178), Z(AV0Z10100520)
n3:cisloPeriodika
1
n3:dodaniDat
n5:2014
n3:domaciTvurceVysledku
n12:3835693
n3:druhVysledku
n13:J
n3:duvernostUdaju
n19:S
n3:entitaPredkladatele
n20:predkladatel
n3:idSjednocenehoVysledku
62446
n3:idVysledku
RIV/68378271:_____/13:00421345
n3:jazykVysledku
n14:eng
n3:klicovaSlova
maghemite; microwave discharge; Mossbauer spectroscopy; magnetic measurements
n3:klicoveSlovo
n8:maghemite n8:magnetic%20measurements n8:Mossbauer%20spectroscopy n8:microwave%20discharge
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[26E3F6F42173]
n3:nazevZdroje
Physics Procedia
n3:obor
n6:BM
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
7
n3:projekt
n7:1M0512 n7:GA202%2F08%2F0178 n7:ED1.1.00%2F02.0068 n7:GA106%2F08%2F1440
n3:rokUplatneniVysledku
n5:2013
n3:svazekPeriodika
44
n3:tvurceVysledku
Kudrle, V. Šantavá, Eva Synek, P. Jašek, O. Schneeweiss, Oldřich Pizúrová, Naděžda David, Bohumil
n3:zamer
n18:AV0Z10100520
s:issn
1875-3892
s:numberOfPages
7
n17:doi
10.1016/j.phpro.2013.04.025