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Issue 35, 2018
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A new carbon allotrope with orthorhombic symmetry formed via graphitic sheet buckling

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Abstract

We identified by ab initio calculations a new simple orthorhombic carbon allotrope with Pmc21 (C2v2) symmetry that has a 32-atom unit cell in all-sp3 hybridized covalent bonds. This new carbon phase can be formed from graphite via a one-layer by three-layer slip and buckling mechanism along the [210] direction above 7.16 GPa and is more favorable than previously proposed cold-compressed graphite phases such as Z-carbon and M-carbon in terms of both kinetics and energetics. Its dynamic stability has been confirmed by phonon mode analysis. Electronic band structure calculations reveal that it has a large indirect band gap of 5.91 eV, wider than that of diamond, which is expected to be optically transparent. The calculated hardness of 95.1 GPa is comparable to 97.5 GPa for diamond. These results offer insights into understanding the complex structural landscape of compressed graphite.

Graphical abstract: A new carbon allotrope with orthorhombic symmetry formed via graphitic sheet buckling

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Article information


Submitted
29 Jun 2018
Accepted
16 Aug 2018
First published
17 Aug 2018

Phys. Chem. Chem. Phys., 2018,20, 22762-22767
Article type
Paper

A new carbon allotrope with orthorhombic symmetry formed via graphitic sheet buckling

Z. Li and J. Wang, Phys. Chem. Chem. Phys., 2018, 20, 22762
DOI: 10.1039/C8CP04129F

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