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Nanocrystalline α–Fe, Fe3C, and Fe7C3 produced by CO2 laser pyrolysis

Published online by Cambridge University Press:  31 January 2011

Xiang-Xin Bi ,
B. Ganguly ,
G.P. Huffman ,
F.E. Huggins ,
M. Endo  and
P.C. Eklund
Xiang-Xin Bi
Affiliation:
Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40506
B. Ganguly
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506
G.P. Huffman
Affiliation:
Department of Physics and Astronomy and Department of Materials Science and Engineering, University of Kentucky, Lexington, Kentucky 40506
F.E. Huggins
Affiliation:
Department of Materials Science and Engineering, University of Kentucky, Lexington, Kentucky 40506
M. Endo
Affiliation:
Department of Electrical Engineering, Shinshu University, Nagano-city 380, Japan
P.C. Eklund
Affiliation:
Center for Applied Energy Research and Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506
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Abstract

Nanocrystalline α–Fe, Fe3C, and Fe7C3, particles with narrow size distributions were produced by CO2 laser pyrolysis of vapor mixtures of Fe(CO)5 and C2H4. Details of the synthesis procedure are discussed. Mossbauer spectroscopy and x-ray diffraction were used to identify the structural phases and the former was used also to study the magnetism of the nanoparticles. All the nanoparticles were observed to be ferromagnetic in this size range. If excess C2H4 appears in the reactant gas mixture, several monolayers of pyrolytic carbon were observed to form on the particle surface, as deduced from transmission electron microscopy and Raman scattering studies. Results of thermo-gravimetric analysis/mass spectroscopy studies of this carbon coating indicate it is gasified in hydrogen at temperatures T ∼ 250 °C.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 7 , July 1993 , pp. 1666 - 1674
Copyright
Copyright © Materials Research Society 1993

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