Abstract
THOUGH the correspondence of etch-pits to dislocation has been investigated by many workers for various crystals, there have not been many direct observations of spiral structure of the etch-pit, which may be considered to be related to the screw dislocation. Spiral etch-pits on sodium chloride1, on germanium2,3, on silicon4, on α brass5, and on antimony6 have been reported. The observed step-heights of etch-terraces are in the range 500 A–40,000 A. Since these values of step-heights are large in comparison with a Burgers vector, the relation between these spiral etch-pits and the screw-dislocation is not as definite as that between the spiral growth pattern of crystal and the screw-dislocation.
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