A Field Emission Stem Study of the Br Distribution in Brominated Graphite Fibers
Brominated pitch based graphite fibers exhibit certain novel properties and potential applications [1,2]. For example, it has been observed that an 18 fold reduction of their resistivities of the pitch-based graphite fibers can be achieved if the pristine fibers are allowed to fully interact with bromine  and even the residual fiber compounds that are formed by pumping off the bromine from the fully brominated fibers (saturated fibers), exhibit a five-fold reduction in the resistivities relative to that of the pristine fibers . To understand this property, it is essential to know the Br distribution in such fiber compounds. Here we focus on the residual fibers that have a density of 2.2 gm/cm3 corresponding to a composition of BrC4 5.
KeywordsScan Transmission Electron Microscope Incident Electron Graphite Fiber Incident Electron Beam Electron Path
Unable to display preview. Download preview PDF.
- 1.J.G. Hooley and U.R. Diets, Carbon 16, 251 (1978)Google Scholar
- 2.J.R. Gaier and D. Marino, NASA TM-87016,1985.Google Scholar
- 3.J.R. Gaier, NASA TM-87275,1986.Google Scholar
- 4.J.I. Goldstein in Introduction to Analytical Electron Microscopy, edited by J.J. Hern, J.I. Goldstein and D.C. Joy ( Plenum Press, New York and London, 1979 ).Google Scholar
- 5.X.W. Qian, S.A. Solin, and J.R. Gaier, Phys. Rev., submitted.Google Scholar