The reaction kinetics of the various species of mobile defects in irradiated materials were crucially dependent on the dimensionality of their migration. Sink strengths for one-dimensionally (1D) gliding interstitial loops undergoing occasional direction changes were described analytically and confirmed by kinetic Monte Carlo simulations. Such simulations were used here to investigate a different transition from 1D to 3D diffusion of 1D gliding loops for which their 1D migration was interrupted by occasional 2D migration due to conservative climb by dislocation core diffusion within a plane transverse to their 1D glide direction. Their transition from 1D to 3D kinetics was significantly different from that due to direction changes. The kinetic Monte Carlo results were compared to an analytical description of this diffusion mode in the form of a master curve relating the 1D normalized sink strength to the frequency of disturbance of 1D migration.

Kinetic Monte Carlo Studies of the Reaction Kinetics of Crystal Defects that Diffuse One-Dimensionally with Occasional Transverse Migration. H.L.Heinisch, H.Trinkaus, B.N.Singh: Journal of Nuclear Materials, 2007, 367-370A, 332-7