Abstract
The concentration of the distributed impurity calcium in KCl crystals is varied and its influence on the etching action has been studied. As the concentration of the distributed impurity calcium is increased in KCl crystals, the etched samples show the following essential features: (a) increase in the distinctness of the etch pits; (b) a progressive increase in the degree of surface roughness; and (c) gradual variation of the etch pit morphology. These observations suggest that the distributed impurity calcium acts as an additional poison during etching.
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