2023-12-13 エディンバラ大学
◆1980年代から研究されてきた炭窒化物の潜在力がついに解き明かされ、国際チームが新しい超硬度物質を合成しました。これらの物質は、ダイヤモンドの特性を維持したまま、フォトルミネッセンスや高エネルギー密度などの追加の特性も備えており、究極のエンジニアリング材料として注目されています。研究はAdvanced Materialsに掲載され、英国RI FLFスキームと欧州研究助成金によって資金提供されました。
＜関連情報＞
- https://www.ed.ac.uk/news/2023/ultra-hard-material-to-rival-diamond-discovered
- https://onlinelibrary.wiley.com/doi/full/10.1002/adma.202308030
CN4四面体を持つ超非圧縮・回収可能な炭素窒化物の合成に成功 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. Abrikosov, Leonid Dubrovinsky, Natalia Dubrovinskaia
Advanced Materials Published: 11 October 2023
DOI:https://doi.org/10.1002/adma.202308030
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.
