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Non-dislocation etch patterns on doped KCl crystals

Etching studies of KCl crystals doped with Ca2+ are carried out. These solution-grown crystals contained 1·44±0·02 weight percent calcium as estimated by EDTA titration. Establishing the etchants that attack at the sites of dislocations, and at sites other than those of dislocations, and comparing this etching behaviour with that of pure KCl crystals, it is shown that non-dislocation etch pits are at the sites of Ca2+ ions.