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There is a marked difference in the growth habits of ZnO crystals grown from ZnSe and ZnS starting materials. Since selenium has a higher boiling point than sulfur and the reaction takes place at lower temperatures when the crystals are grown from ZnSe, the selenium may interact with the growing surface. This may be a cause for residual strain in the ZnO crystals grown from ZnSe starting material. The residual strain is observed as spin splittings of the donor-bound exciton transitions. Adoi:10.1103/physrevb.56.13753 fatcat:xc5doomcu5hk3c4arxldj6oony