Structural polytypism of lead iodide and its relationship to screw dislocations

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Abstract
An x-ray study of single crystals of lead iodide has shown that structural polytypism exists in this compound. Type 2H is the most common structure. Out of 100 crystals studied 93 were pure 2H while most of the others showed the presence of this structure syntactically coalesced with them. Other less common structures are 4H, 6H, 6R and 12R. Structural data are given for each of these. A consideration of screw dislocations shows they can be used to account for the abundance of the 2H form, as well as the occasional occurrence of other structures.

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