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Nanopowders with superparamagnetic Fe3C particles and their annealing behaviour
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SYSNO ASEP 0354295 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Nanopowders with superparamagnetic Fe3C particles and their annealing behaviour Author(s) David, Bohumil (UFM-A) RID
Schneeweiss, Oldřich (UFM-A) RID, ORCID
Pizúrová, Naděžda (UFM-A) RID, ORCID
Dumitrache, F. (RO)
Fleaca, C. (RO)
Alexandrescu, R. (RO)Source Title Surface and Interface Analysis. - : Wiley - ISSN 0142-2421
Roč. 42, č. 6-7 (2010), s. 699-702Number of pages 4 s. Action European Conference on Applications of Surface and Interface Analysis /13./ Event date 18.10.2009-23.10.2009 VEvent location Antalya Country TR - Turkey Event type WRD Language eng - English Country GB - United Kingdom Keywords Fe3C ; nanocomposite ; magnetic measurements ; Mössbauer spectroscopy ; superparamagnetism Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects 1M0512 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA202/08/0178 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000281149700054 DOI 10.1002/sia.3389 Annotation Two samples of nanopowders containing superparamagnetic Fe3C and Fe3O4/gamma-Fe2O3 particles and carbon black were synthesized by the method of laser-induced homogeneous pyrolysis of gaseous precursors. Both were characterized by XRD, HR-TEM, 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. Fe3C phase in both samples exhibited reduced Curie temperature and smeared ferromagnetic-paramagnetic transition. After annealing of the samples at 800°C for 30min the Curie temperature of the recrystallized Fe3C phase in both samples was 214°C (standard bulk value). Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2011
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