Abstract
Cadmium iodide and lead iodide have been highly purified by a horizontal zone refining technique. Dendritic single crystals of PbI2-doped cadmium iodide have been grown from vapour phase in vacuum. The effect of doping on polytype formation and other structural characteristics has been studied by X-ray diffraction. The crystals have shown the formation of rhombohedral polytype 12R in about 50% of cases, along with the common polytype 4H of cadmium iodide. This is in sharp contrast to earlier findings for undoped dendritic crystals which exclusively contained the polytype 4H. Further, unlike the undoped crystals, some of the doped crystals also show streaking and arcing on their X-ray photographs. The observed structural changes may be governed by both thermodynamical considerations and the kinetics of crystal growth and the observed streaking and arcing result from internal stresses built up around the relatively large Pb2+ ions in the host CdI2 structure.
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Schedule a callMore From: Acta Crystallographica Section A Foundations of Crystallography
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