High-pressure synthesis of superhard material from C60

Takashi Horikawa, Kaichi Suito, Michihiro Kobayashi, Ryuichiro Oshima

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Fullerene, C60, has been investigated at a high pressure of 15 GPa and at a high temperature of 800°C using an octahedral anvil press. Samples retrieved after being heated to temperatures between 165 and 700°C under pressures from 10 to 15 GPa were found to be very hard, exhibiting micro-Vickers hardness ranging from 40 to 100 GPa. The hardness was governed by the pressure and temperature conditions studied as well as the duration of the high-temperature treatment. X-ray diffraction analysis and Raman scattering studies revealed that the hard products contained amorphous carbon consisting of sp2-bonded clusters with a small persistence of unknown phase.

Original languageEnglish
Pages (from-to)3141-3146
Number of pages6
JournalJapanese Journal of Applied Physics
Issue number5 A
Publication statusPublished - 2005 May


  • Fullerene
  • Hardness
  • High pressure
  • High temperature
  • X-ray diffraction


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