Thin films of tin(II) iodide were prepared and characterized. The lattice structure of thin films determined by X-ray diffraction is different from that of bulk SnI 2 . This change of lattice is explained by a polymorphous transition of monoclinic a-SnI 2 to hexagonal b-SnI 2 . The unit cell parameters of b-SnI 2 are a ¼ (4.506 AE 0.014) A, c ¼ (6.946 AE 0.011) A. Thin films of b-SnI 2 have predominant [001] orientation.
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