| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Urtra-Hard Bonds in P-Carbon Stronger than Diamond |
| GUO Wen-Feng, WANG Ling-Sheng, LI Zhi-Ping, XIA Mei-Rong, GAO Fa-Ming** |
Key Laboratory of Applied Chemistry, Yanshan University, Qinhuangdao 066004
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| Cite this article: |
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GUO Wen-Feng, WANG Ling-Sheng, LI Zhi-Ping et al 2015 Chin. Phys. Lett. 32 096201 |
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Abstract The hardness and ideal strength of P-carbon, i.e., a new carbon phase for the cold-compressed carbon with an orthogonal structure recently proposed and named as P-carbon, are investigated by means of first-principles calculations. The strength calculations reveal that the failure mode in P-carbon is dominated by the tensile type. The ideal tensile strength of P-carbon is calculated to be 76.7 GPa in the [001] direction, which is higher than that of the previously known most stable Z-carbon, of 71.4 GPa. Meanwhile, the theoretical Vickers hardness of P-carbon is estimated as 89 GPa, which is comparable with that of diamond. Especially, two types of bonds in P-carbon with hardness values of 114 GPa and 105 GPa are significantly stronger than those of diamond. The results provide insight into exploration of the ultra-hard P-carbon for potentially technological applications.
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Received: 19 May 2015
Published: 02 October 2015
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| PACS: |
62.20.-x
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(Mechanical properties of solids)
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