Počet záznamů: 1
Powders with superparamagnetic Fe3C particles studied with Mössbauer spectrometry
- 1.
SYSNO ASEP 0354265 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Powders with superparamagnetic Fe3C particles studied with Mössbauer spectrometry Tvůrce(i) David, Bohumil (UFM-A) RID
Schneeweiss, Oldřich (UFM-A) RID, ORCID
Dumitrache, F. (RO)
Fleaca, C. (RO)
Alexandrescu, R. (RO)
Morjan, I. (RO)Zdroj.dok. Journal of Physics: Conference Series. - : Institute of Physics Publishing - ISSN 1742-6588
Roč. 217, č. 1 (2010), 012097Poč.str. 4 s. Akce International Conference on the Applications of the Mossbauer Effect (ICAME 2010) Datum konání 19.07.2009-24.07.2009 Místo konání Vídeň Země AT - Rakousko Typ akce WRD Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova Fe3C ; superparamagnetism ; Mössbauer spectroscopy ; magnetic measurements ; laser-induced pyrolysis Vědní obor RIV BM - Fyzika pevných látek a magnetismus CEP GA202/08/0178 GA ČR - Grantová agentura ČR 1M0512 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000287181700097 DOI 10.1088/1742-6596/217/1/012097 Anotace Two nanopowders with superparamagnetic Fe3C particles were synthesised by the method of laser-induced pyrolysis of gaseous precursors. Both were characterised by X-ray diffraction, Mössbauer spectrometry and standard magnetic measurements. The mean crystallite size of Fe3C was 3 nm for the first sample and 10 nm for the second sample (Scherrer formula), i.e. it was lower than in our previously studied ferromagnetic Fe 3C-based sample. Fe3C phase in both present samples exhibited by 20 K reduced Curie temperature which is interpreted as a nanosize effect. After annealing of the samples at 1073 K for 30 minutes the Curie temperature of the Fe3C phase in both samples matched its standard bulk value. Beside Fe3C phase also Fe3O4 and carbon black were present in the synthesised samples. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2011
Počet záznamů: 1