Simulation was used to estimate the diffusion constants of point defects such as a single vacancy or a self-interstitial atom under hydrostatic pressure. The Stillinger-Weber potential was used as a model potential. The diffusion constants for self-interstitials were almost independent of pressure between -50 and 50kbar. A self-interstitial atom diffused with the formation of a dumb-bell structure which was aligned in the [110] direction. For a single vacancy, the diffusion constants were also independent of pressure between -40 and 40kbar. A vacancy diffused, via a switching mechanism, to the nearest-neighbor atoms in the lattice site.

Molecular Dynamics Analysis on Diffusion of Point Defects. Kakimoto, K., Umehara, T., Ozoe, H.: Journal of Crystal Growth, 2000, 210[1], 54-9