The growth behavior of barium titanate crystals from molten potassium fluoride at 1000°C may be described in some detail by the Frank growth mechanism. In particular the role of reentrant twin angles as growth step sources was examined. A finite supersaturation is required for the operation of this source and the event must occur by an easier nucleation process than homogeneous two-dimensional nucleation.
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DeVries et al. (1961) studied this question.
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