Abstract
An attempt has been made to explain quantitatively the interface depths seen in crystals of CdxHg1−xTe quenched while growing under ACRT conditions. Three regimes of acceleration are identified and linked to the interface depths at various rotation rates. Stability in the Ekman flow is found to be critical in maintaining a flat growth interface. Attempts to freeze-in Couette flows in ACRT melts were not successful, although they are believed to exist. Axial composition variations have revealed a stirred Ekman region ahead of a growth interface in one crystal. As the starting melt composition increases a slush region forms ahead of the interface which could be associated with constitutional supercooling.
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