J. Phys. IV France 09 (1999) Pr8-537-Pr8-544
Preparation of iron carbide and iron nanoparticles by laser-induced gas phase pyrolysisR. Alexandrescu1, S. Cojocaru1, A. Crunteanu1, I. Morjan1, I. Voicu1, L. Diamandescu2, F. Vasiliu2, F. Huisken3 and B. Kohn3
1 National Institute for Lasers, Plasma and Radiation Physics, Lasers Department, P.O. Box MG-36, 76900 Bucharest, Romania
2 National Institute for Material Physics, P.O. Box MG-7, 76900 Bucharest, Romania
3 Max-Planck-Institut für Strömungsforschung, Bunsenstrasse 10, 37073 Göttingen, Germany
Iron carbides and iron composites present a particular interest due to their magnetic and catalytic properties which could be highly enhanced if particles in the nanometric size range were used. We present results on the synthesis and characterization of iron-carbide nanoparticles by sensitized CO2 laser pyrolysis of gas mixtures containing iron pentacarbonyl (vapors) and ethylene/acetylene precursors. The influence of the nature of hydrocarbon on the structural properties of the nanopowders are revealed by different analytical techniqnes (IR spectrophotometry, X-ray diffraction, transmission electron microscopy and Mössbauer spectroscopy).
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