SUMMARYSolid-state diffusion is a m

SUMMARY
Solid-state diffusion is a means of mass transport within solid materials by stepwise atomic motion.
The term “self-diffusion” refers to the migration of host atoms ; for impurity atoms, the term “interdiffusion” is used. Two mechanisms are possible : vacancy and interstitial. For a given host metal, interstitial atomic species generally diffuse more rapidly.