Stage III migration of point defects in molybdenum

Abstract

In a continuing discussion concerning the migrating species in Stage III annealing of metals with a fairly compact crystal structure, it is demonstrated that positron annihilation can be used to give information on this problem. The general principle is to measure the recovery of radiation damage in a crystal containing an unbiased sink relative to another crystal where this sink is not present. The consequences of the two models are discussed. It is found that, in molybdenum, vacancies are the migrating species.