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Phase Analysis of the Fe-C Nanopowder Prepared by Laser Pyrolysis

  • B. David
  • M. Vondráček
  • O. Schneeweiss
  • P. Bezdička
  • R. Alexandrescu
  • I. Morjan
Part of the NATO Science Series book series (NAII, volume 94)

Abstract

Iron-carbide-based compounds and composites present a particular interest due to their structural and magnetic properties. Different carbide phases are known, such as the orthorombic cementite (Fe3C), the monoclinic Hägg carbide (Fe5C2), the hexagonal Fe2C. Another metastable phase Fe7C3 was synthesized only when the precursor iron oxides, contained small amounts of Ba [1]. A new class of nanopowder iron-carbide materials were synthesized in the past few years by Rice and coworkers [2,3] and by Ecklund and coworkers [4]. Both groups applied the method of laser pyrolysis from gas phase reactants [5], in which a powerful CW CO2 laser is used to heat a mixture of gases through the absorption of the laser radiation by at least one of the gas components. By using this technique, the production of other carbides and composites (like SiC, Si/C/N, TiC, Ti/Si/C) were reported [6,7]. The catalytic and magnetic properties of iron-based bulk materials could be highly enhanced if particles in the nanometer size were obtained. Using the laser induced pyrolysis of a sensitized system containing iron pentacarbonyl vapors, γ-Fe particles [8] and iron-oxide-based nanopowders [9] were recently reported. In a previous work we presented preliminary results on the synthesis of iron-carbide-based nanopowders by the laser pyrolysis of gas mixtures containing iron pentacarbonyl vapors and ethylene as carrier gas [10].

Keywords

Mossbauer Spectroscopy Iron Carbide Rotary Pump Mossbauer Spectrum Thermomagnetic Curve 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 2003

Authors and Affiliations

  • B. David
    • 1
  • M. Vondráček
    • 1
  • O. Schneeweiss
    • 1
  • P. Bezdička
    • 2
  • R. Alexandrescu
    • 3
  • I. Morjan
    • 3
  1. 1.Institute of Physics of Materials ASCRCzech Republic
  2. 2.Institute of Inorganic Chemistry ASCRCzech Republic
  3. 3.National Institute for Lasers, Plasma and Radiation PhysicsRomania

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