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Title: A New Carbon Allotrope with Six-Fold Helical Chains in all-sp2 Bonding Networks

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep04339· OSTI ID:1624697
 [1];  [2];  [3];  [4]
  1. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics
  2. Univ. of Nevada, Las Vegas, NV (United States). Dept of Physics. High Pressure Science and Engineering Center
  3. Peking Univ., Beijing (China). School of Physics. International Center for Quantum Materials. Collaboration Innovation Center of Quantum Matter
  4. 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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