Acoustic Microscopy and Surface Brillouin Scattering of Amorphous Carbon Pressure-Synthesized from C60
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 C(60) under high pressure and temperature. The super hard phases of amorphous carbon were synthesized from C(60) 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 (v(L)) 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 2001
- Accession Number
- ADP012165
Entities
People
- Alexander G. Lyapin
- Murli H. Manghnani
- Pavel V. Zinin
- Sergey Tkachev
- Xinya Zhang
Organizations
- University of Hawaiʻi System