A New Carbon Allotrope with Six-Fold Helical Chains in all-sp2 Bonding Networks
- Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics
- Univ. of Nevada, Las Vegas, NV (United States). Dept of Physics. High Pressure Science and Engineering Center
- Peking Univ., Beijing (China). School of Physics. International Center for Quantum Materials. Collaboration Innovation Center of Quantum Matter
- Tohoku Univ., Sendai (Japan). New Industry Creation Hatchery Center; Russian Academy of Sciences (RAS), Novosibirsk (Russian Federation). Siberian Branch. Inst. of Thermophysics
Using a recently developed approach to constructing covalent network structures from linear carbyne, we identify by ab initio calculations a new carbon allotrope in R3m (D5 3d) symmetry that comprises six-fold helical chains with alternating sp2 -type single and double bonds along the chains that are connected via zigzag benzene rings. This 6-fold carbene is characterized as a three-dimensional three-connected chiral crystalline modification of graphite. Phonon and electronic band calculations indicate that this new structure is dynamically stable and is a semiconductor with a band gap of 0.47 eV, in contrast to the semimetallic nature of graphite. Simulated x-ray diffraction patterns of the 6-fold carbene provide an excellent match to the previously unexplained distinct diffraction peak of a new carbon allotrope found in recent detonation experiments. These results establish a new carbon phase and offer insights into its outstanding structural and electronic properties.
- Research Organization:
- Univ. of Nevada, Reno, NV (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- NA0001982
- OSTI ID:
- 1624697
- Journal Information:
- Scientific Reports, Vol. 4, Issue 1; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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