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Statements

Subject Item
n2:RIV%2F68081723%3A_____%2F01%3A07013169%21RIV%2F2003%2FAV0%2FA07003%2FN
rdf:type
n20:Vysledek skos:Concept
dcterms:description
Nanopowders of the Fe-C based material were prepared by laser irradiation of the Fe(CO)5 vapors mixed with C2H4 as a carrier gas. The as prepared powder was characterized by TEM, XRD and IR. Magnetic behaviour was investigated using Mössbauer spectroscopy and magnetic measurements. In the sample of the as prepared state there were identified bcc alpha-Fe, Fe3C and iron oxide phases in agreement of all methods applied. Comparison of Mössbauer spectra taken at 300K and at 20K shows that prevailing amount of oxide particles exhibits superparamagnetic behaviour. The hysteresis loop corresponds well to an assembly of nanoparticles. In the thermomagnetic curve (measured in vacuum at increasing temperature up to 800 C) critical temperatures of the phases alpha-Fe, Fe3C and gamma-Fe2O3 can be identified. The part of the curve corresponding to decreasing temperature and subsequent measurement of the Mössbauer spectra witnesses that changes in the phase composition of the sample occurred. During the heatingat Nanopowders of the Fe-C based material were prepared by laser irradiation of the Fe(CO)5 vapors mixed with C2H4 as a carrier gas. The as prepared powder was characterized by TEM, XRD and IR. Magnetic behaviour was investigated using Mössbauer spectroscopy and magnetic measurements. In the sample of the as prepared state there were identified bcc alpha-Fe, Fe3C and iron oxide phases in agreement of all methods applied. Comparison of Mössbauer spectra taken at 300K and at 20K shows that prevailing amount of oxide particles exhibits superparamagnetic behaviour. The hysteresis loop corresponds well to an assembly of nanoparticles. In the thermomagnetic curve (measured in vacuum at increasing temperature up to 800 C) critical temperatures of the phases alpha-Fe, Fe3C and gamma-Fe2O3 can be identified. The part of the curve corresponding to decreasing temperature and subsequent measurement of the Mössbauer spectra witnesses that changes in the phase composition of the sample occurred. During the heatingat
dcterms:title
Magnetic behaviour of the Fe-C nanopowders prepared by laser synthesis from ethylene / iron pentacarbonyl gas phase mixture. Magnetic behaviour of the Fe-C nanopowders prepared by laser synthesis from ethylene / iron pentacarbonyl gas phase mixture.
skos:prefLabel
Magnetic behaviour of the Fe-C nanopowders prepared by laser synthesis from ethylene / iron pentacarbonyl gas phase mixture. Magnetic behaviour of the Fe-C nanopowders prepared by laser synthesis from ethylene / iron pentacarbonyl gas phase mixture.
skos:notation
RIV/68081723:_____/01:07013169!RIV/2003/AV0/A07003/N
n3:strany
55
n3:aktivita
n15:Z n15:P
n3:aktivity
P(KSK1010104), P(OC 523.20), Z(AV0Z2041904)
n3:dodaniDat
n11:2003
n3:domaciTvurceVysledku
n4:8716587 n4:4343883 n4:6329446
n3:druhVysledku
n9:D
n3:duvernostUdaju
n16:S
n3:entitaPredkladatele
n6:predkladatel
n3:idSjednocenehoVysledku
685688
n3:idVysledku
RIV/68081723:_____/01:07013169
n3:jazykVysledku
n7:eng
n3:klicovaSlova
nanopowder; laser synthesis; Mössbauer spectroscopy
n3:klicoveSlovo
n13:laser%20synthesis n13:M%C3%B6ssbauer%20spectroscopy n13:nanopowder
n3:kontrolniKodProRIV
[BDE0005786C0]
n3:mistoKonaniAkce
Limerick [IE]
n3:mistoVydani
Limerick
n3:nazevZdroje
COST-ACTION 523 Mid term Meeting and Workshop On Nanomaterials: Fundamentals and Applications - Abstracts.
n3:obor
n10:BM
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
5
n3:pocetUcastnikuAkce
0
n3:pocetZahranicnichUcastnikuAkce
0
n3:projekt
n14:OC%20523.20 n14:KSK1010104
n3:rokUplatneniVysledku
n11:2001
n3:tvurceVysledku
Schneeweiss, Oldřich Vondráček, Martin Morjan, I. David, Bohumil Alexandrescu, R.
n3:typAkce
n19:EUR
n3:zahajeniAkce
2001-10-04+02:00
n3:zamer
n17:AV0Z2041904
s:numberOfPages
1
n12:hasPublisher
Department of Physics, University of Limerick