Evaporation Spirals and Loops on KCl Single Crystals

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Abstract
Cleavage faces of potassium chloride single crystals have been thermally etched. The thermal etch patterns consist of irregular spiral patterns and closed loops. Inter-ferometric study has revealed that they are depressions. The centres of the spirals are not distinct. It is therefore conjectured that the spirals without distinct centres might have been formed as explained by Lang (1957). While the patterns similar to that developing at Frank-Read sources and the complicated pattern originating from number of sources concentrated in a small region may be due to screw dislocations.