Solid-state synthesis of alpha-Fe and iron carbide nanoparticles by thermal treatment of amorphous Fe2O3

0341011 - ÚFM 2010 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Schneeweiss, Oldřich - Zbořil, R. - David, Bohumil - Heřmánek, M. - Mašláň, M.
Solid-state synthesis of alpha-Fe and iron carbide nanoparticles by thermal treatment of amorphous Fe2O3.
ISIAME 2008. New York: Springer, 2009 - (Kuzmann, E.; Lazar, K.), s. 167-173. ISBN 978-3-642-01369-0.
[International Symposium on the Industrial Applications of the Mossbauer Effect (ISIAME 2008) /7./. Budapest (HU), 17.08.2008-22.08.2008]
Grant CEP: GA ČR GA106/08/1440; GA MŠMT 1M0512
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: Iron oxides * Solid-state synthesis * Nanocrystalline powder
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus

Thermal treatment of amorphous iron(III) oxide nanopowder (2–3 nm) in various atmospheres is presented as a simple route towards α-Fe and iron carbides nanoparticles. The chemical composition and size of nanoparticles can be controlled using the reaction temperature, annealing time and atmosphere (hydrogen, carbon monoxide, hydrocarbons). To monitor the structure, phase composition, size, morphology and magnetic properties of nanoparticles, XRD, Mössbauer spectroscopy, and magnetic measurements were carried out. The measurements of temperature dependence of magnetic moment yield information on the critical temperatures of magnetic and phase transformations. Application of hydrogen atmosphere results in the formation of α-Fe, while iron carbides (Fe3C) can be obtained in atmospheres of carbon monoxide or hydrocarbons.
Trvalý link: http://hdl.handle.net/11104/0184127