The simplest dense carbon allotrope: Ultra-hard body-centered tetragonal C4
Langue
en
Article de revue
Ce document a été publié dans
Journal of Solid State Chemistry. 2022, vol. 314, p. 123424
Elsevier
Résumé en anglais
From crystal chemistry rationale and geometry optimization onto ground state structures with DFT-based computations, a novel ultra-hard body centered tetragonal C 4 (tet-C 4) is proposed as the simplest dense carbon ...Lire la suite >
From crystal chemistry rationale and geometry optimization onto ground state structures with DFT-based computations, a novel ultra-hard body centered tetragonal C 4 (tet-C 4) is proposed as the simplest dense carbon allotrope. tet-C 4 is identified as cohesive as diamond, and likewise built of corner sharing C4 tetrahedra in all directions. Qualified as mechanically stable from the elastic constants combinations, tet-C 4 has Vickers hardness identical to that of both cubic and hexagonal (lonsdaleite) diamond. Dynamical stability of tet-C 4 derived from all positive phonon bands also allows obtaining heat capacity close to the experimental data of diamond. The electronic band tructure shows insulating tet-C 4 with a large indirect band gap of 5 eV.< Réduire
Mots clés en anglais
carbon allotropes
crystal chemistry
DFT
ultra-hard materials
thermal properties
phonons
Origine
Importé de halUnités de recherche