Magnetic behaviour of the Fe-C nanopowders prepared by laser synthesis from ethylene / iron pentacarbonyl gas phase mixture.

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Magnetic behaviour of the Fe-C nanopowders prepared by laser synthesis from ethylene / iron pentacarbonyl gas phase mixture.

Popis výsledku v původním jazyce

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 amountof 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

Název v anglickém jazyce

Magnetic behaviour of the Fe-C nanopowders prepared by laser synthesis from ethylene / iron pentacarbonyl gas phase mixture.

Popis výsledku anglicky

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 amountof 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

Druh

D - Stať ve sborníku

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2001

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

COST-ACTION 523 Mid term Meeting and Workshop On Nanomaterials: Fundamentals and Applications - Abstracts.

ISBN

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ISSN

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e-ISSN

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Počet stran výsledku

1

Strana od-do

55

Název nakladatele

Department of Physics, University of Limerick

Místo vydání

Limerick

Místo konání akce

Limerick [IE]

Datum konání akce

4. 10. 2001

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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