Abstract
An unusual diffusion enhancement of Ti in Ar+ prebombarded MgO(100) was observed during postbombardment annealing at 1100 °C. Ti diffusion in the postannealed sample is enhanced with respect to the sample without postannealing. Thermal dissociation of small cationic vacancy clusters is known to be responsible for this type of radiation enhanced diffusion (RED), or nonsteady state RED. It is inferred from previous work that the small vacancy clusters are mainly divacancies. The unusual diffusion enhancement is attributed to thermal dissociation of large vacancy clusters during postannealing, leading to a divacancy creation mechanism. A model is proposed which qualitatively explains the observed diffusion enhancement.
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