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Preparation and Properties of FeCo Nanoparticles

  1. 1. 0354517 - UFM-A 2011 RIV US eng C - Conference Paper (international conference)
    Zábranský, Karel - David, Bohumil - Pizúrová, Naděžda - Schneeweiss, Oldřich - Zbořil, R. - Mašláň, M.
    Preparation and Properties of FeCo Nanoparticles.
    Mössbauer Spectroscopy in Materials Science - 2010. Melville, New York: American Institute of Physics, 2010 - (Tuček, J.; Miglierini, M.), s. 102-107. AIP Conference Proceedings, Vol. 1258. ISBN 978-0-7354-0806-7. ISSN 0094-243X.
    [MSMS 10 - Mossbauer Spectroscopy in Materials Science 2010. Liptovský Ján (SK), 31.01.2010-05.02.2010]
    R&D Projects: GA MŠk 1M0512; GA ČR GA106/08/1440
    Institutional research plan: CEZ:AV0Z20410507
    Keywords : nanocrystalline * magnetic * Fe-Co
    Subject RIV: BM - Solid Matter Physics ; Magnetism

    Fe-Co nanoparticles were prepared from the binary Fe-Co oxalate. The formation of FeCo metallic phase begun at 290 °C as determined from the X-ray diffraction spectra recorded during heating of the oxalate sample in hydrogen atmosphere. The reduction finished at 500 °C by formation of bcc FeCo phase with the mean particle size of about 50 nm. Analysis of Mössbauer spectra shows that the ferromagnetic FeCo phase is represented by two sextets corresponding to interiors and surfaces of the nanoparticles. In addition to a weak paramagnetic component represented by the doublet which was ascribed to fine particles in superparamagnetic state. The TEM has shown conglomerates of particles with composition about 50 at. % Fe and 50 at. % Co.
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