Synthesis of Ultra-Incompressible and Recoverable Carbon Nitrides Featuring CN4 Tetrahedra

Dominique Laniel*, Florian Trybel, Andrey Aslandukov, Saiana Khandarkhaeva, Timofey Fedotenko, Yuqing Yin, Nobuyoshi Miyajima, Ferenc Tasnádi, Alena V. Ponomareva, Nityasagar Jena, Fariia Iasmin Akbar, Bjoern Winkler, Adrien Néri, Stella Chariton, Vitali Prakapenka, Victor Milman, Wolfgang Schnick, Alexander N. Rudenko, Mikhail I. Katsnelson, Igor A. AbrikosovLeonid Dubrovinsky, Natalia Dubrovinskaia

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Carbon nitrides featuring three-dimensional frameworks of CN4 tetrahedra are one of the great aspirations of materials science, expected to have a hardness greater than or comparable to diamond. After more than three decades of efforts to synthesize them, no unambiguous evidence of their existence has been delivered. Here, the high-pressure high-temperature synthesis of three carbon-nitrogen compounds, tI14-C3N4, hP126-C3N4, and tI24-CN2, in laser-heated diamond anvil cells, is reported. Their structures are solved and refined using synchrotron single-crystal X-ray diffraction. Physical properties investigations show that these strongly covalently bonded materials, ultra-incompressible and superhard, also possess high energy density, piezoelectric, and photoluminescence properties. The novel carbon nitrides are unique among high-pressure materials, as being produced above 100 GPa they are recoverable in air at ambient conditions.
Original languageEnglish
Article number2308030
Pages (from-to)1-12
Number of pages12
JournalAdvanced Materials
Issue number3
Early online date11 Oct 2023
Publication statusPublished - 10 Dec 2023

Keywords / Materials (for Non-textual outputs)

  • 3D frameworks of CN4 tetrahedra
  • Ambient conditions recoverability
  • Carbon nitrides
  • Diamond anvil cell
  • High pressure syntheses
  • Single-crystal X-ray diffraction
  • Superhardness
  • Ultra-incompressibility


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