Accession Number:

ADA256464

Title:

Surface Phonon Dispersion of MoS2

Descriptive Note:

Technical rept.

Corporate Author:

AEROSPACE CORP EL SEGUNDO CA MECHANICS AND MATERIALS TECHNOLOGY CENTER

Personal Author(s):

Report Date:

1992-07-31

Pagination or Media Count:

18.0

Abstract:

The dispersion of phonons on the 0001 surface of MoS2 was measured by high-resolution electron energy loss spectroscopy along both the 010 and 110 azimuths i.e., r to K and r to M respectively. The surface phonons have lower energies than the corresponding bulk phonons, which indicates that the bonding interactions of the surface atoms are different from those of the bulk, even in a layer lattice compound. Since sputtered MOS2 lubricant films are composed of many small crystallites, the relative number of surface atoms in a film is much higher than in a single crystal. The stronger bonding of the surface layer may affect the amount of inter- vs intra-crystalline slip in the lubrication mechanism- This work also demonstrates the use and usefulness of a new technique high-resolution electron energy loss spectroscopy in this laboratory. Molybdenumdisulfide, Electron energy loss spectroscopy, Surface vibrational spectroscopy, Layer-lattice compounds.

Subject Categories:

  • Physical Chemistry
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE