Effect of Uniaxial Stress on the Raman Spectra of Graphite Fibers.
Abstract
Measurements of the effect of uniaxial stress on the frequency of the zone center optical phonons in heat-treated benzene-derived graphite fibers have been performed using first-order Raman scattering. Application of uniaxial stress along the fiber axis was found to cause polarization-dependent splittings and shifts of the Raman peaks of the zone center doubly degenerate optical phonons. From these observed splittings and shifts, experimental values for the phenomenological coefficients which describe the changes in the elastic constant of these phonons with strain were determined. It is concluded that Raman spectroscopy can be used to characterize the local stress or strain conditions of graphite fibers nondestructively. Keywords: Effect of uniaxial stress, Raman spectra of carbon fibers, Raman microprobe spectroscopy, Single carbon fibers.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 30, 1987
- Accession Number
- ADA191730
Entities
People
- G. Dresselhaus
- H. Sakata
- M. Endo
- M. S. Dresselhaus
Organizations
- Massachusetts Institute of Technology