Abstract
The perturbed γγ-angular correlation method (PAC) allows an investigation of microscopic environments of probe nuclei in solids through the hyperfine interaction. By implantation of radioactive tracer ions below the ppm level the properties of the host material in most cases remain unchanged. The multiple advantages of using an ion implanter to insert the radioactive tracer ions are illustrated by our systematic PAC investigations in oxides. The examples chosen are the annealing of radiation induced defects (e.g. in NiO, CoO); phase transformations between different crystalline structures (Mn 3O 4 → Mn 2O 3), a refinement of ionic positions (bixbyite oxides) and dynamics of electronic defects on a 10 −9–10 −6 s time scale (Cr 2O 3). In insulating compounds the probe ion itself introduces excited electronic defect levels (La 2O 3).
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