Abstract
The growth of hexagonal prisms of zinc oxide single crystals with sizes of 2 mm thickness and 100 mm length and up to 8 mm thickness and 35 mm length has been accomplished by the reaction of zinc vapor with atmospheric oxygen in an open horizontal system. The zinc vapor is produced by the hydrogen reduction of zinc oxide in a reaction whose rate is dependent on the specific surface area of the zinc oxide starting material. This reaction is not allowed to reach equilibrium, and excess hydrogen establishes an oxygen concentration gradient in the crystallization chamber. A thin filament used as substrate markedly limits the number of growing crystals by its small surface area. The growth parameters have been related to the experimental system, thus making the process completely reproducible.
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