Structural and Kinetic Properties of Graphite Intercalation Compounds
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 29, 1983
- Accession Number
- ADA129579
Entities
People
- Deborah D. Chung
Organizations
- Carnegie Mellon University