Journal
PHYSICAL REVIEW B
Volume 91, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.214106
Keywords
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Funding
- National Natural Science Foundation of China [11274356, 11374341]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB07000000]
- DOE [DE-NA0001982]
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Recent shock compression experiments produced clear evidence of a new carbon phase, but a full structural identification has remained elusive. Here we establish by ab initio calculations a body-centered cubic carbon phase in Ia (3) over bard (O-h(10)) symmetry, which contains twelve atoms in its primitive cell, thus termed BC12, and comprises all-sp(3) six-membered rings. This structural configuration places BC12 carbon in the same bonding type as cubic diamond, and its stability is verified by phonon mode analysis. Simulated x-ray diffraction patterns provide an excellent match to the previously unexplained distinct diffraction peak found in shock compression experiments. Electronic band and density of states calculations reveal that BC12 is a semiconductor with a direct band gap of similar to 2.97 eV. These results provide a solid foundation for further exploration of this new carbon allotrope.
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