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Title: The phase diagram and hardness of carbon nitrides

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep09870· OSTI ID:1184778
 [1];  [2];  [1];  [1]
  1. Stony Brook Univ., NY (United States). Dept. of Geosciences and Center for Materials by Design, Inst. for Advanced Computational Science
  2. 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

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:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Government of the Russian Federation
Grant/Contract Number:
SC0012704; EAR-1114313; DMR-1231586
OSTI ID:
1184778
Journal Information:
Scientific Reports, Vol. 5; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 80 works
Citation information provided by
Web of Science

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Cited By (11)

(L) 2 C 2 P 2 : Dicarbondiphosphide Stabilized by N-Heterocyclic Carbenes or Cyclic Diamido Carbenes journal April 2017
Ferroelectricity and Elasticity of Rhombohedral BiFeO 3 Under Uniaxial Stress journal February 2018
Pharaoh's Serpents: New Insights into a Classic Carbon Nitride Material: Pharaoh's Serpents: New Insights into a Classic Carbon Nitride Material journal October 2017
Alkaline-earth metal (Mg) polynitrides at high pressure as possible high-energy materials journal January 2017
Carbon nitrides: synthesis and characterization of a new class of functional materials journal January 2017
One step synthesis of efficient photocatalysts by TCAP doped g-C 3 N 4 for enhanced visible-light photocatalytic activity journal January 2020
Ground-state structures, physical properties and phase diagram of carbon-rich nitride C 5 N journal August 2018
Investigation on the Stability of Derivative Melam from Melamine Pyrolysis under High Pressure journal March 2018
(L) 2 C 2 P 2 : Dicarbondiphosphide Stabilized by N-Heterocyclic Carbenes or Cyclic Diamido Carbenes journal April 2017
Cubic C3N: A New Superhard Phase of Carbon-Rich Nitride journal October 2016
Nitrogen oxides under pressure stability, ionization, polymerization, and superconductivity preprint January 2015

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