It is alternatively referred to as the direct interstitial mechanism. Diffusion coefficients for atoms undergoing migration through the direct interstitial mechanism typically exhibit relatively high values because the interstitial atom does not have to wait for a defect to align in order to execute a jump. This mechanism is relevant for the migration of small atoms that can easily occupy interstitial positions and which do not significantly disturb the atoms of the host material from their normal lattice positions when they move.