Accession Number:

ADA229776

Title:

Imaging of Stacking Faults in Highly Oriented Psrolytic Graphite Using Scanning Tunneling Microscopy

Descriptive Note:

Technical rept. no. 16, 1 Jan-31 Oct 1990,

Corporate Author:

MINNESOTA UNIV MINNEAPOLIS DEPT OF CHEMICAL ENGINEERING AND MATERIALS SCIENCE

Report Date:

1990-12-03

Pagination or Media Count:

14.0

Abstract:

Scanning tunneling microscopy images of the 0001 plane of highly oriented pyrolytic graphite show defect regions consisting of an extensive network of partial dislocations that form extended and contracted nodes. The partial dislocations in hexagonal graphite enclose triangular regions about 1000 nm on a side of faulted material comprised of rhombohedral graphite. Tunneling spectroscopy shows differences in the dependence of the tunneling current on voltage between the faulted and unfaulted regions. Electronic and elastic interactions of the tip with the HOPG surface are proposed to explain the observed image contrast between hexagonal and rhombohedral graphite. ttl

Subject Categories:

  • Ceramics, Refractories and Glass

Distribution Statement:

APPROVED FOR PUBLIC RELEASE