Accession Number:

ADP012165

Title:

Acoustic Microscopy and Surface Brillouin Scattering of Amorphous Carbon Pressure-Synthesized from C60

Descriptive Note:

Proceedings

Corporate Author:

HAWAII UNIV HONOLULU SCHOOL OF OCEAN AND EARTH SCIENCE AND TECHNOLOGY

Report Date:

2001-04-01

Pagination or Media Count:

6.0

Abstract:

Here, we report successful measurements by surface Brillouin scattering SBS and scanning acoustic microscopy SAM of the elastic properties of small specimens of amorphous carbon obtained from C60 under high pressure and temperature. The super hard phases of amorphous carbon were synthesized from C60 at pressure 13 - 13.5 GPa and temperature 800-900 degrees C. Two types of acoustic waves have been detected by 5155 in super hard samples surface Rayleigh wave and bulk longitudinal wave. The longitudinal velocity vL in the hardest sample is slightly lower than longitudinal wave velocity in diamond in 11O direction. Simultaneous measurements of the Rayleigh and longitudinal wave velocities make it possible to determine shear and bulk elastic model of the specimens. Obtained elastic properties for amorphous carbon synthesized under pressure 13.5 GPa and temperature 900 degrees C are close to those for diamond, indicating that bonds among amorphous carbon network are diamond bonding dominated.

Subject Categories:

  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE