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Powders with superparamagnetic Fe3C particles studied with Mössbauer spectrometry
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SYSNO ASEP 0354265 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Powders with superparamagnetic Fe3C particles studied with Mössbauer spectrometry Author(s) David, Bohumil (UFM-A) RID
Schneeweiss, Oldřich (UFM-A) RID, ORCID
Dumitrache, F. (RO)
Fleaca, C. (RO)
Alexandrescu, R. (RO)
Morjan, I. (RO)Source Title Journal of Physics: Conference Series. - : Institute of Physics Publishing - ISSN 1742-6588
Roč. 217, č. 1 (2010), 012097Number of pages 4 s. Action International Conference on the Applications of the Mossbauer Effect (ICAME 2010) Event date 19.07.2009-24.07.2009 VEvent location Vídeň Country AT - Austria Event type WRD Language eng - English Country GB - United Kingdom Keywords Fe3C ; superparamagnetism ; Mössbauer spectroscopy ; magnetic measurements ; laser-induced pyrolysis Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GA202/08/0178 GA ČR - Czech Science Foundation (CSF) 1M0512 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000287181700097 DOI 10.1088/1742-6596/217/1/012097 Annotation 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. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2011
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