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) : Chung, Deborah D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a129579.pdf


Report Date : 29 Apr 1983


Pagination or Media Count : 186


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.


Descriptors :   *GRAPHITE , *LAYERS , *REACTION KINETICS , *STRUCTURAL PROPERTIES , ACOUSTIC MEASUREMENT , BROMINE , CHEMICAL COMPOUNDS , CRYSTAL LATTICES , DESORPTION , DILATOMETERS , EXFOLIATION , EXPANSION , INTERACTIONS , MICROSCOPY , PHASE TRANSFORMATIONS , PYROLYTIC GRAPHITE , SYMMETRY(CRYSTALLOGRAPHY) , TEMPERATURE , THERMOGRAVIMETRIC ANALYSIS , X RAY DIFFRACTION


Subject Categories : Physical Chemistry
      Miscellaneous Materials


Distribution Statement : APPROVED FOR PUBLIC RELEASE