Abstract
Radioactive111In+ ions were implanted into an α-Al2O3 single crystal. The hyperfine parameters of111Cd at substitutional Al lattice sites were identified by measuring the perturbed angular correlation for different sample orientations. The electric field gradientV zz =1.04(17)·1022V/m2 was obtained from the quadrupole coupling constant. This result is compared with the efg values of27Al in α-alumina and111Cd in α-Fe2O3, which also has the corundum structure. Two additional fractions with broad frequency distributions were observed, one of which is attributed to111Cd atoms in a strongly distorted Al2O3-lattice.
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