Accession Number:

ADA129579

Title:

Structural and Kinetic Properties of Graphite Intercalation Compounds

Descriptive Note:

Final rept. 1 Mar 1978-28 Feb 1983

Corporate Author:

CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF METALLURGICAL ENGINEERING AND MATERIALS SCIENCE

Personal Author(s):

Report Date:

1983-04-29

Pagination or Media Count:

186.0

Abstract:

An extensive investigation was undertaken on the mechanism, kinetics and thermodynamics of intercalation of graphite. It was found that bromine intercalate transport in graphite at room temperature occurred by solid-state intercalate displacement. Upon exposure by stage-2 graphite-bromine to IC1, bromine was expelled by the incoming IC1, which dissolved the remaining bromine to form a solid solution with the IC1 in-plane superlattice. During bromine intercalation, an intercalate front moved toward the center of the graphite. The first time-temperature-transformation TTT diagram describing the stage evolution during intercalation was obtained. The TTT-curves for bromine intercalation were C-shaped for the growth of each stage, suggesting diffusion- controlled kinetics at low temperatures and interface-controlled kinetics at high temperatures. The pressure-temperature equilibrium diagram for stages 2-4 of graphite-bromine was determined. Based on the change in free energy from stage of stage and the intercalate diffusion rate, the kinetics of bromine intercalation of graphite was modeled.

Subject Categories:

  • Physical Chemistry
  • Miscellaneous Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE