Abstract
Precise measurements of the electric field gradient (EFG) with the perturbed angular correlation method (PAC) in Cd and Zn show significant differences between single-crystalline and poly-crystalline samples. These differences (up to four percent at low temperatures) decrease with increasing temperature and vanish at about 2 60 K. In all samples the lowest EFG values are obtained for single crystals. In poly-crystalline samples the EFG as well as the width of the EFG distribution increase with decreasing grain size. This effect is also observed in semiconducting ZnO.
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