Abstract
The dendrite crystals of metallic Se grown from the vapor with the supersaturation ratio maintained constant at 25 to 100 can be classified into five groups depending on the shape and crystal structure. The growth mechanism of these dendrite crystals except one group relates to the twinning. The difference in the shape of these denddrite crystals mainly comes from the number of twin boundaries contained therein and the mutual relations between them. The growth of dendrite crystals containing two twin boundaries mainly starts at the steps and kinks formed by overlapping of two thin films originating from each boundary.

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