Abstract
Single crystals of lead iodide have been purified and grown using the method of zone refining and their polytypism has been studied by X-ray diffraction. Oscillation photographs obtained from several different regions of the crystals have revealed that the polytype 12R has its maximum occurrence in melt-grown crystals, followed by an occasional occurrence of the polytype 4H. An examination of crystals with different degrees of purification has revealed that impurities present in the starting material are responsible for an occasional transformation of 12R into 4H.
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