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Abstract
We investigated a process of crystallization of ZnO by the chemical transport method using bromine and chlorine as transport agents. The choice of transport agents followed from approximate thermodynamical calculations. The experiments confirmed their predicted high transporting capacities. The influence of external conditions on the transport rate and on the form of obtained crystals was investigated. The crystals were transparent, colorless or lightly yellow-green. Their conductivity was of n-type, the resistivity varied from 50 ohm cm to 300 ohm cm and the Hall mobility was about 160cm 2/V sec at room temperature. The majority of the obtained crystals was in the form of hexagonal prisms. When Br 2 was used as a transport agent, the crystals were about 5 mm long their cross section was about 2 mm 2. When Cl 2 was used as transport agent the crystals were larger, their cross section was of the order of a few square millimeters and their length varied from 5 to 15 mm.
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