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

Published online by Cambridge University Press:  21 March 2011

Pavel V. Zinin ,
Murli. H. Manghnani ,
Sergey Tkachev ,
Xinya Zhang ,
Alexander G. Lyapin ,
Vadim V. Brazhkin  and
Ivan A. Trojan
Pavel V. Zinin
Affiliation:
School of Ocean and Earth Science and Technology, University of Hawaii Honolulu, HI 96822, USA
Murli. H. Manghnani
Affiliation:
School of Ocean and Earth Science and Technology, University of Hawaii Honolulu, HI 96822, USA
Sergey Tkachev
Affiliation:
School of Ocean and Earth Science and Technology, University of Hawaii Honolulu, HI 96822, USA
Xinya Zhang
Affiliation:
School of Ocean and Earth Science and Technology, University of Hawaii Honolulu, HI 96822, USA
Alexander G. Lyapin
Affiliation:
Institute for High Pressure Physics, Russian Academy of Sciences Troitsk, Moscow District 142092, Russia
Vadim V. Brazhkin
Affiliation:
Institute for High Pressure Physics, Russian Academy of Sciences Troitsk, Moscow District 142092, Russia
Ivan A. Trojan
Affiliation:
Institute for High Pressure Physics, Russian Academy of Sciences Troitsk, Moscow District 142092, Russia
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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 superhard phases of amorphous carbon were synthesized from C60 at pressure 13 – 13.5 GPa and temperature 800–900°C. Two types of acoustic waves have been detected by SBS in superhard samples: surface Rayleigh wave and bulk longitudinal wave. The longitudinal velocity (νL) in the hardest sample is slightly lower than longitudinal wave velocity in diamond in [110] direction. Simultaneous measurements of the Rayleigh and longitudinal wave velocities make it possible to determine shear and bulk elastic moduli of the specimens. Obtained elastic properties for amorphous carbon synthesized under pressure 13.5 GPa and temperature 900°C are close to those for diamond, indicating that bonds among amorphous carbon network are diamond bonding dominated.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 675: Symposium W – Nanotubes, Fullerenes, Nanostructured and Disordered Carbon , 2001 , W11.9.1
Copyright
Copyright © Materials Research Society 2001

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