Abstract
The relation between substructure and purity was investigated by using zone-refined tin. In single crystals of zone-refined tin, grown in parallel with [110] at fairly high speed (e.g. 0.8 mm/min) there appeared no linear substructure. The reticulate substructure of irregular shape was less in these crystals than in the specimen of low purity. As to the perfection of crystal, no difference was almost observed between two specimens which were grown from zone-refined tin at speeds of 0.05 and 0.8 mm/min respectively. Therefore, at speeds below a certain value, the speed of growth seems have no influence upon the perfection of crystal, and is high purity, most important.
