Convective transport in melt growth systems

Abstract Most melt growth systems are thermal transport controlled, i.e. the kinetic undercooling of the growth surface and the depression of the freezing point due to the added solute are both small. In consequence, the microscopic growth rate and the solute incorporation are very sensitive to time variation in the melt temperature. In this review several aspects of this problem are considered but first the basic pattern of flow in the Czochralski melt is discussed. The spoke pattern which occurs on oxide melts is described and possible explanations reviewed. The catastrophic flow transitions observed in two particular oxide melts are described. Some general considerations of time dependent flow are given and a detailed description of such flow in a floating zone is provided. Finally, recent theoretical and experimental studies of the coupling between morphological and convective instabilities are described.

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