Abstract
Single crystals of ZnSe are grown by sublimation in closed ampoules of fused silica at temperatures between 1300 and 1400 K. With a video camera it is observed that the crystals develop preferably {1 1 0} faces. The free corner of three {1 1 0} faces appears as the preferred place of formation of a nucleus in twinned position. Repeated twin formation leads to a dominant growth in the 〈1 1 1〉 direction. In the presence of SiS 2, however, {1 0 0} and {1 1 1} faces appear near equilibrium and twins form on {1 1 1} faces resulting in a preferred growth in 〈1 1 2〉 directions. These observations are qualitatively explained by an idealized atomic arrangement of growth steps.
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