The phase diagram and hardness of carbon nitrides
- Stony Brook Univ., NY (United States). Dept. of Geosciences and Center for Materials by Design, Inst. for Advanced Computational Science; BROOKHAVEN SCIENCE ASSOCIATES, LLC
- Stony Brook Univ., NY (United States). Dept. of Geosciences and Center for Materials by Design, Inst. for Advanced Computational Science; Moscow Inst. of Physics and Technology (Russian Federation); Northwestern Polytechnical Univ., Xi'an (China). School of Materials Science]; Zhu, Qiang [Stony Brook Univ., NY (United States). Dept. of Geosciences and Center for Materials by Design, Inst. for Advanced Computational Science
- Stony Brook Univ., NY (United States). Dept. of Geosciences and Center for Materials by Design, Inst. for Advanced Computational Science
Novel superhard materials, especially those with superior thermal and chemical stability, are needed to replace diamond. Carbon nitrides (C-N), which are likely to possess these characteristics and have even been expected to be harder than diamond, are excellent candidates. Here we report three new superhard and thermodynamically stable carbon nitride phases. Based on a systematic evolutionary structure searches, we report a complete phase diagram of the C-N system at 0–300 GPa and analyze the hardest metastable structures. Surprisingly, we find that at zero pressure, the earlier proposed graphitic-C3N4 structure (P6-bar m2) is dynamically unstable, and we find the lowest-energy structure based on s-triazine unit and s-heptazine unit.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- Government of the Russian Federation; National Science Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 1184778
- Journal Information:
- Scientific Reports, Journal Name: Scientific Reports Vol. 5; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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