Abstract
Thick and optically perfect crystals of lead iodide have been grown in U-tubes by silica gel method. As compared to the growth in test tubes, the number of nucleation centres is considerably reduced. It has been discovered that the diffusion of lead ions through the gel is quicker than the diffusion of iodine ions. The complete crystal structure of a 24-layered hexagonal polytype grown by this method has been worked out. The structure is represented as (11) 52112112112 in Zhdanov symbol, with space group P3m1. The complete growth history of the crystal of which this polytype formed a part has also been studied by successive cleavages followed by X-ray examination. They have revealed curious structural transformation of crystal structure during growth.
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