| Dislocation etch pits of zinc single crystals grown by modified Bridgman method were studied using etchants of Gilman. The effects of deformation and heat treatment on the substructure of etch pits were also investigated. Elongated cell structures, which were observed by Kratochvil and Sichovla were not found from the as grown crystals. But nonelongated cell structures were detected occasionally. The secondary substructures following homogenization of segregated impurities were not found. Annealed samples have shown grown subgrains and also secondary substructures. Some samples were deformed (bending) at 100℃ or 180℃ during the slow cooling following annealing, and proceeded further slow cooling until it reached room temperature. The substructures which were induced through deformation, were found but not the secondary substructures. With the samples, which were annealed at about 300℃ after deformation, deformation-induced substructures were not found mostly. But greatly grown secondary substructures were found. With the deformed crystals the growth of secondary substructures through heating were more enhanced than undeformed ones. |
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