Abstract
Transparent single crystals of KBr with cubo-octahedral habit have been grown from aqueous solution containing PbI2 as an impurity. On cube faces of these crystals, square-shaped hillocks with growth layers in the <100> direction have been observed; while on octahedral faces, strictly crystallographically oriented triangular hillocks and cone-shaped hillocks have been observed. Occasionally, growth spirals on octahedral as well as on cube faces have also been observed. It is shown that the cone-shaped hillocks on (111) faces are nucleated at the sites of dislocations, whereas the triangular hillocks have nothing to do with dislocations. The implications are discussed.
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