An x-ray study of over 600 crystals of PbI2 has revealed some important facts for the formulation of a satisfactory epitaxial theory of polytypism. Some new polytypes are described, the largest being 48R with c=167.5 Å. The distribution of rhombohedral polytypes found can be described by a Poisson distribution, ps=e−mm8/s!, with m=12. Evidence for a mechanism whereby an nH polytype together with a Shockley partial dislocation a/3[01̄10] can result in a 3nR polytype is presented. The general applicability of this nH-3nR mechanism is discussed. Miscellaneous results obtained from an investigation of syntactic coalescence are reported and shown to be in harmony with the epitaxial theory.
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Hanoka et al. (1968) studied this question.
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