Abstract
Positron annihilation experiments reveal an open-volume defect in the deep state atomic configurations of bistable donors In and Ga in CdF2. The size of the open volume is at least half of a monovacancy. The results are similar to those obtained previously for the DX centers in the covalent system AlxGa1−xAs. It is therefore likely that the bond-breaking mechanism (substitutional to interstitial atomic motion) responsible for metastability of point defects in covalent semiconductors is more universal and its validity extends to even some highly ionic compounds, like CdF2.
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