Accession Number:

ADA101040

Title:

Structural and Kinetic Properties of Graphite Intercalation Compounds.

Descriptive Note:

Annual rept. 1 Mar 80-28 Feb 81,

Corporate Author:

CARNEGIE-MELLON UNIV PITTSBURGH PA

Personal Author(s):

Report Date:

1981-06-18

Pagination or Media Count:

63.0

Abstract:

The processes of the intercalation of graphite, the desorption of intercalated graphite, and the exfoliation of intercalated graphite have been studied by using x-ray diffraction, x-ray absorption, optical microscopy, thermogravimetry, dilatometry and acoustic emission measurement. Emphasis was given to the structural changes which occur during these processes and the kinetics of these processes. For bromine intercalation, it was found that intercalation does not involve a progressive change in stage, although the final stage n may be dominated by the next higher stage n1 during the early part of the intercalation process. Furthermore, it was confirmed that the final stage increases with increasing temperature for the same intercalate activity, and that the rate of interaction increases with increasing temperature. On the other hand, desorption was found to involve a progressive increase of stage. Moreover, desorption was found to begin at the edge of the sample, resulting in a difference in stage between the edge and central regions of the c-face the concentration gradient was found to increase with decreasing stage. The amount of expansion observed on exfoliation was found to be determined principally by the parent stage formed during intercalation the higher is the stage of the parent, the larger is the amount of expansion.

Subject Categories:

  • Physical Chemistry
  • Miscellaneous Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE