Abstract
AbstractThe Perturbed Angular Correlation method was applied to measure the hyperfine interaction of the 111Cd‐nucleus after implantation of its radioactive mother isotope 111ln (≈ 1012 ions at E ≈ 400 keV) into various metal‐oxides (NiO, CuO, AgO, Cu2O, Ag2O, Al2O3, Cr2O3, In2O3, Rh2O3). In most cases we were able to identify 111Cd on substitutional sites in a defect‐free oxide surrounding by proper thermal annealing of our samples. The capability of the PAC method to resolve small changes in the microsurrounding will be demonstrated by the results of our experiments on In2O3. Exemplary, the application of the technique to the observation of magnetical, structural and chemical phase transitions in NiO, Rh2O3, AgO and CuO will be discussed. By comparing the experimental values with a simple point charge model, a systematic behaviour of the electric field gradients was found.
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