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Statements

Subject Item
n2:RIV%2F68378271%3A_____%2F12%3A00392673%21RIV14-AV0-68378271
rdf:type
n5:Vysledek skos:Concept
dcterms:description
Two nanopowders synth. in microwave plasma:the first one in a torch discharge at 1 bar,the second one in low-pressure plasma at 40 mbar. Morphology, composition and properties studied by TEM, XRD, Raman and Mössbauer spectra, magnetic meas.. By XRD only gamma- Fe2O3 identified (mean crystallite size dXRD 24 nm for the first and 13 nm for the second one). From the Mössbauer spectra meas.at 5 K, no other iron oxide phases found in both samples. Unusually strong temp. dependence of the Lamb-Mössbauer factor observed: ISA(5 K)/ISA(293 K)=6 in the case of the first sample and ISA(5 K)/ISA(293 K)=22 for the second sample (ISA denotes integral spectrum area),which explained as the consequence of the reduced clump of electrically charged nanoparticles in the plasma, i.e., particles can either move at 293 K (when they are free) or tilt (if they are a chain part). No superparamagnetic phase at 293 K by Mössbauer spectra of both samples. Two nanopowders synth. in microwave plasma:the first one in a torch discharge at 1 bar,the second one in low-pressure plasma at 40 mbar. Morphology, composition and properties studied by TEM, XRD, Raman and Mössbauer spectra, magnetic meas.. By XRD only gamma- Fe2O3 identified (mean crystallite size dXRD 24 nm for the first and 13 nm for the second one). From the Mössbauer spectra meas.at 5 K, no other iron oxide phases found in both samples. Unusually strong temp. dependence of the Lamb-Mössbauer factor observed: ISA(5 K)/ISA(293 K)=6 in the case of the first sample and ISA(5 K)/ISA(293 K)=22 for the second sample (ISA denotes integral spectrum area),which explained as the consequence of the reduced clump of electrically charged nanoparticles in the plasma, i.e., particles can either move at 293 K (when they are free) or tilt (if they are a chain part). No superparamagnetic phase at 293 K by Mössbauer spectra of both samples.
dcterms:title
gamma-Fe2O3 nanopowders synthesized in microwave plasma and extraordinarily strong temperature influence on their Mössbauer spectra gamma-Fe2O3 nanopowders synthesized in microwave plasma and extraordinarily strong temperature influence on their Mössbauer spectra
skos:prefLabel
gamma-Fe2O3 nanopowders synthesized in microwave plasma and extraordinarily strong temperature influence on their Mössbauer spectra gamma-Fe2O3 nanopowders synthesized in microwave plasma and extraordinarily strong temperature influence on their Mössbauer spectra
skos:notation
RIV/68378271:_____/12:00392673!RIV14-AV0-68378271
n5:predkladatel
n16:ico%3A68378271
n3:aktivita
n7:P n7:I
n3:aktivity
I, P(GA202/08/0178), P(GD104/09/H080)
n3:cisloPeriodika
12
n3:dodaniDat
n8:2014
n3:domaciTvurceVysledku
n18:3835693
n3:druhVysledku
n10:J
n3:duvernostUdaju
n13:S
n3:entitaPredkladatele
n11:predkladatel
n3:idSjednocenehoVysledku
137705
n3:idVysledku
RIV/68378271:_____/12:00392673
n3:jazykVysledku
n17:eng
n3:klicovaSlova
gamma-Fe2O3; nanoparticles; Mössbauer and Raman spectra; XRD; TEM; magnetic meas
n3:klicoveSlovo
n4:M%C3%B6ssbauer%20and%20Raman%20spectra n4:XRD n4:gamma-Fe2O3 n4:TEM n4:nanoparticles n4:magnetic%20meas
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[C88C8E25F06F]
n3:nazevZdroje
Journal of Nanoscience and Nanotechnology
n3:obor
n15:BM
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
6
n3:projekt
n6:GD104%2F09%2FH080 n6:GA202%2F08%2F0178
n3:rokUplatneniVysledku
n8:2012
n3:svazekPeriodika
12
n3:tvurceVysledku
David, Bohumil Jašek, O. Šantavá, Eva Pizúrová, Naděžda Schneeweiss, Oldřich Kudrle, V.
n3:wos
000315172400062
s:issn
1533-4880
s:numberOfPages
9
n19:doi
10.1166/jnn.2012.6767