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Issue Eur. Phys. J. Appl. Phys.
Volume 32, Number 3, December 2005
Page(s) 177 - 185
Section Characterization of Materials: Imaging,\ Microscopy and Spectroscopy
DOI 10.1051/epjap:2005094
Published online 14 December 2005

Eur. Phys. J. Appl. Phys. 32, 177-185 (2005)
DOI: 10.1051/epjap:2005094

Characterization of carbon and iron nanostructures synthesized by the DC arc discharge method: influence of the location in the reactor and of the pressure

A. Fnidiki1, D. Lemarchand1, E. Talbot1 and H. Pascard2

1  Groupe de Physique des Matériaux, UMR CNRS 6634, Institut des Matériaux de Rouen, Université de Rouen, avenue de l'Université, BP 12, 76801 Saint-Étienne du Rouvray, France
2  Laboratoire des Solides Irradiés, UMR CNRS 7642, DRECAM-CEA, École Polytechnique, route de Saclay, 91128 Palaiseau, France

abdeslem.fnidiki@univ-rouen.fr

(Received: 1st October 2004 / Received in final form: 17 June 2005 / Accepted: 20 July 2005 / Published online: 14 December 2005)

Abstract
X-ray diffraction, Mössbauer spectroscopy, Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) techniques were used to characterize the Fe-C phases in the soots synthesized by the DC arc discharge method. Various equilibrium and non-equilibrium Fe-C compounds were identified, with fractions depending on both the location in the reactor and the helium gas pressure. The soots obtained are composed of the same five phases (C-graphite, $\alpha$-Fe, $\gamma$-Fe, Fe3C and Fe5C2) whatever the helium gas pressure and wherever they are situated in the reactor. However, the location in the reactor has a considerable influence on the size of the particles in the nanostructure. The Fe-C compounds in the Pyrex vessel samples (CL) seem only to be present in the form of nanoparticles embedded in an amorphous gangue, while the water-cooled copper cylinder samples (RS) contain, in addition to these nanoparticles, large composite crystalline particles.

PACS
52.80.Mg - Arcs; sparks; lightning; atmospheric electricity.
81.05.Uw - Carbon, diamond, graphite.
61.18.Fs - Magnetic resonance techniques; Mössbauer spectroscopy.
61.46.+w - Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals.
61.10.Nz - X-ray diffraction.

© EDP Sciences 2005


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