Abstract
Silver faces with only a few exactly known dislocation emergence points were etched electrochemically. Deep pyramidal etch pits were observed on the screw dislocations whereas flat-bottomed pits arise on the edge dislocations. Qualitatively, this fact corresponds to the results obtained with natural, i.e. as-grown from the vapour phase, {0001}-faces of zinc single crystals. They were etched electrochemically by a new „droplet” technique. Quantitatively, the formation of two-dimensional negative nuclei during the etching of the edge-dislocation emergence points is understood as an atomistic process. Electrochemical etching of zinc was compared with chemical etching. It was concluded that SO4 selective adsorption (from ZnSO4 aqueous solution) changes significantly the polar diagram of the lateral dissolution rate on the basal face of the zinc single crystals and that the electrochemical etching reveals better the actual structure of these crystals.
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