We theoretically investigate a hypothetical sp(3) 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 Gamma and the Raman spectra to existing Raman data for a possible noncubic phase of diamond.
Serra, S., Benedek, G., Facchinetti, M., Miglio, L. (1998). Possible high-pressure phase of diamond. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 57(10), 5661-5667 [10.1103/PhysRevB.57.5661].
Possible high-pressure phase of diamond
BENEDEK, GIORGIO;MIGLIO, LEONIDA
1998
Abstract
We theoretically investigate a hypothetical sp(3) 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 Gamma and the Raman spectra to existing Raman data for a possible noncubic phase of diamond.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.