Abstract
We theoretically investigate a hypothetical form of diamond carbon with 16 atoms per unit cell. It contains fivefold rings as a possible result of fullerene transformation under pressure and could be a stable phase of diamond at high pressure. We have calculated the ground-state structure, the cohesive energy, the bulk modulus, and the electronic density of states by means of tight-binding molecular-dynamics and density-functional total-energy calculations. Finally we have compared the phonon spectra at and the Raman spectra to existing Raman data for a possible noncubic phase of diamond.
- Received 22 August 1997
DOI:https://doi.org/10.1103/PhysRevB.57.5661
©1998 American Physical Society