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Effects of excess carbon and vibrational properties in ultrafine SiC powders

Published online by Cambridge University Press:  15 September 1999

S. Charpentier ,
A. Kassiba ,
A. Bulou ,
M. Monthioux  and
M. Cauchetier
S. Charpentier
Affiliation:
Laboratoire de Physique de l'état condensé (UPRES-A CNRS 6087), Université du Maine, Faculté des Sciences, avenue Olivier Messiaen, 72085 Le Mans Cedex 09, France
A. Kassiba*
Affiliation:
Laboratoire de Physique de l'état condensé (UPRES-A CNRS 6087), Université du Maine, Faculté des Sciences, avenue Olivier Messiaen, 72085 Le Mans Cedex 09, France
A. Bulou
Affiliation:
Laboratoire de Physique de l'état condensé (UPRES-A CNRS 6087), Université du Maine, Faculté des Sciences, avenue Olivier Messiaen, 72085 Le Mans Cedex 09, France
M. Monthioux
Affiliation:
CEMES (UPR CNRS 8011), B.P. 4347, 29 rue Jeanne Marvig, 31055 Toulouse Cedex, France
M. Cauchetier
Affiliation:
CEA-DRECAM, Service des Photons Atomes et Molécules, CE Saclay, 91191 Gif-sur-Yvette Cedex, France
*
[email protected]
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Abstract

Structural and vibrational properties are investigated in SiC nanopowders synthesized by a CO2 laser pyrolysis of (SiH4, C2H2) gaseous mixture and thermally treated up to 1800 °C. The structural modifications of the SiC crystallites and the arrangement of the carbon in excess are monitored at different annealing stages. A critical behaviour is revealed in the powder annealed at T a = 1500 °C through the features of the Raman spectra and the insulating-conductor transition. The significant electric conductivity (σ ≈ 0.05 S cm−1) which appears above T a is discussed with respect to the powder composition and the interface effects where the carbon in excess seems to play a key role.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 8 , Issue 2 , September 1999 , pp. 111 - 121
Copyright
© EDP Sciences, 1999

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