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Bicrystals containing symmetrical tilt boundaries with either the or the direction as the rotation axis were vapor‐grown at 1740°C using the reaction 2AlCl 3 ( g )+3CO 2 ( g ) + 3H 2 ( g )→.Al 2 O 3 ( s ) + 6HCl( g ) + 3CO( g ). Specimens as large as 3 by 5 by 20 mm were produced in 24 h. Chemical purity of the specimens is high, with <0.1 ppm total cation impurities, as determined by activation analysis.
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Parker et al. (1970) studied this question.
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