Bond strengths of New Carbon-nitride-Related material C2N2(CH2)

• Published in: Journal of physics. Conference series 2012-07, Vol.377 (1)
• Main Authors: Sougawa, M, Sumiya, T, Takarabe, K, Mori, Y, Okada, T, Gotou, H, Yagi, T, Yamazaki, D, Tomioka, N, Katsura, T, Kariyazaki, H, Sueoka, K, Kunitsugu, S
• Format: Article
• Language: English
• Subjects: Bulk modulus; Carbon; Carbon nitride; Compressibility; Crystals; Diamond anvil cells; Laser beam heating; Lattice parameters; Memberships; Physics; Synthesis; Tetrahedra; Unit cell
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/377/1/012028

A new carbon-nitride-related material C2N2(CH2) nanopletelet was synthesized by subjecting a precursor C3N4HxOy+Au in a laser-heating diamond anvil cell (LHDAC) to the pressure of 40 GPa and the temperature of 1200-2000 K. The synthesized C2N2(CH2) was accordingly found to be an orthorhombic unit cell of the space group Cmc21 with lattice constants a 7.625Å, b 4.490Å, and c 4.047Å. The bulk modulus B0 was determined to be B0 258 ± 3.4 GPa, only the 60 % that of the diamond. C2N2(CH2) consists of the tetrahedrally coordinated C with three C-N single bond and the one C-C single bond, and the bridging carbon with the C-CH2-C bond. The C-N single bond length of the tetrahedron ranges from 1.444 to 1.503 Å. This bond length is close to the C-N single bond of 1.447 to 1.458 Å in the superhard β-C3N4. The compressibility of the C-N and C-C single bond of C2N2(CH2) ranges from 0.976 to 0.982 with the pressure of 30 GPa. These values are very close to the compressibility of the C-N and C-C single bond of 0.978 to 0.982 in β-C3N4, cubic-C3N4, and diamond.