Extended x-ray-absorption fine structure of Ag impurity atoms in electron-irradiated aluminum

Extended x-ray-absorption fine-structure measurements were used to study radiation-induced defects for 400-ppm Ag impurity atoms in Al samples after irradiation with 2.8-MeV electrons at 95 K and after subsequent thermal-annealing treatment. During irradiation, Al interstitials are mobile and annihilate with vacancies or are trapped by the Ag impurity atoms. After irradiation about $\frac{1}{3}$ of the Ag atoms have captured an Al interstitial atom. A very pronounced new Ag-Al distance $R=2.35$ \AA{} is then observed which can be attributed to the Ag-Al distance in a mixed dumbbell that is formed. The observed distances suggest a $〈111〉$ orientation of the mixed dumbbell. During thermal annealing this new structure disappears at about 165 K, and another structure grows at 165 K and disappears at 185 K.

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