Abstract
Neutron activated20F nuclei (T 1/2=11 s) in CaF2 serve for two purposes: first they produce well defined point defects by their (n, γ)-production mechanism, second, they act as probes to detect the properties of these defects in aβ- andγ-ray detected nuclear magnetic resonance experiment. Below about 70 K an interstitial defect is observed due to a quadrupolar splitting of the20F-NMR line. The defect induced electric field gradient is oriented along the 〈111〉-axis of the crystal and causes a quadrupole coupling constante 2 qQ/h=−2.0(1) MHz at the20F site. The defect anneals above 70 K with an Arrhenius like temperature dependence corresponding to an activation energyE M =0.17(4) eV.
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Stöckmann, H.J., Dubbers, D., Grupp, M. et al. Structure and annealing of (n, γ)-Induced point defects in CaF2 . Z Physik B 30, 19–27 (1978). https://doi.org/10.1007/BF01323665
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DOI: https://doi.org/10.1007/BF01323665