Amorphous diamond: A high-pressure superhard carbon allotrope
Journal Article
·
· Physical Review Letters
- Stanford Univ., Stanford, CA (United States)
- Geophysical Lab., Carnegie Inst. of Washington, Washington, DC (United States)
- High Pressure Collaborative Access Team (HPCAT), Geophysical Lab., Carnegie Inst. of Washington, Washington, DC (United States)
- High Pressure Synergetic Consortium, Geophysical Lab., Carnegie Inst. of Washington, Washington, DC (United States)
- SLAC National Accelerator Laboratory, Menlo Park, CA (United States)
Compressing glassy carbon above 40 GPa, we have observed a new carbon allotrope with a fully sp³-bonded amorphous structure and diamondlike strength. Synchrotron x-ray Raman spectroscopy revealed a continuous pressure-induced sp²-to-sp³ bonding change, while x-ray diffraction confirmed the perseverance of noncrystallinity. The transition was reversible upon releasing pressure. Used as an indenter, the glassy carbon ball demonstrated exceptional strength by reaching 130 GPa with a confining pressure of 60 GPa. Such an extremely large stress difference of >70 GPa has never been observed in any material besides diamond, indicating the high hardness of this high-pressure carbon allotrope.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- DOE Contract Number:
- SC0001057
- OSTI ID:
- 1065690
- Journal Information:
- Physical Review Letters, Vol. 107, Issue 17; Related Information: EFree partners with Carnegie Institution of Washington (lead); California Institute of Technology; Colorado School of Mines; Cornell University; Lehigh University; Pennsylvania State University; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
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