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

Titelangaben

Laniel, Dominique ; Trybel, Florian ; Aslandukov, Andrii ; Khandarkhaeva, Saiana ; Fedotenko, Timofey ; Yin, Yuqing ; Miyajima, Nobuyoshi ; Tasnádi, Ferenc ; Ponomareva, Alena V. ; Jena, Nityasagar ; Akbar, Fariia Iasmin ; Winkler, Bjoern ; Néri, Adrien ; Chariton, Stella ; Prakapenka, Vitali ; Milman, Victor ; Schnick, Wolfgang ; Rudenko, Alexander N. ; Katsnelson, Mikhail I. ; Abrikosov, Igor A. ; Dubrovinsky, Leonid ; Dubrovinskaia, Natalia:
Synthesis of Ultra-Incompressible and Recoverable Carbon Nitrides Featuring CN₄ Tetrahedra.
In: Advanced Materials. Bd. 36 (2024) Heft 3 . - 2308030.
ISSN 1521-4095
DOI: https://doi.org/10.1002/adma.202308030

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Abstract

Abstract 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.