Abstract
Equilibrium thermodynamic theories of polytypism are discussed and rejected in favor of a non-equilibrium screw-dislocation theory. It is suggested that the parent dislocation originates through epitaxial growth on a foreign nucleus, whereas Frank's theory assumes that the dislocation originates through buckling and slip of an otherwise perfect protoplate of the crystal. Observations on gel-grown PbI 2 crystals support the present view, and observed discrepancies, which are difficult to explain on Frank's theory, can now be accounted for in a simple manner.
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