Abstract

By using unbiased crystal structure searching technique combined with first-principles calculations, a new superdense carbon phase C10 (space group: C222) with a density of 3.55g/cm3 (larger than that of diamond (3.50g/cm3)) is uncovered. The C10 phase has a 10-atom unit cell in the full sp3 bonding network. A systematic theoretical study of the electronic, dynamic, optical, and elastic properties of superdense carbon C10 was carried out. In addition, we studied the homologous fracture mode by calculating the ideal tensile and shear strength of C10 phase. It was confirmed that C10 is a superhard insulator material with HSE06 band gap of 4.60 eV.

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