Etude de l'evolution d'un carbone graphitable au cours d'un traitement thermique par la fonction de distribution radiale

✍ Scribed by J.P. Rouchy; L. Gatineau

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 848 KB
• Volume: 13
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(75)90027-5

✦ Synopsis

The transient presence of interstitial carbons in the process of transformation of a coke into graphite is deduced from a study of radial distribution function. A peak corresponding to an abnormal interatomic C-C distance of 1.90 .& is observed for the samples heat-treated to 2050°C and to 2100°C. This distance is assigned to interstitial carbons 1.2 A located above or below the hexagonal carbon layers at the center of hexagonal rings. The peak doesn't appear on the radial distribution function obtained either for 1700 or 2500°C. At "low temperature" the interstitials are probably randomly distributed while at 2500°C they are removed by the graphiti~ation process. It is possible to determine from the other peaks observed in the dist~bution function the changes of the C-C distances in the rings and therefore to estimate the distortions within the layers. The measurements shed some light on the mechanism of graphitization.