Abstract
The substitutional fraction (fs) of Au atoms implanted into Fe single crystals at room temperature increases with increasing dose from fs=0.6 for 0.1 at.% Au to fs=1.0 for Au concentrations exceeding 1 at.%. This concentration dependence of fs is attributed to the formation of Au-vacancy complexes. The number of the complexes decreases with increasing Au concentration due to complex dissolution accompanied by the formation of an increasing number of competing vacancy-trapping centers.

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