HEAT-TRANSFER AND THE EXTERNAL MORPHOLOGY OF CZOCHRALSKI-GROWN SILLENITE COMPOUNDS

Experimental results demonstrate changes in the external morphology of sillenite compounds grown by the Czochralski method. To explain these observations, a numerical model of heat transfer which accounts for r adiative cooling and melt convection is applied to this system. Delica te shifts in the balance of heat transfer mechanisms during crystal gr owth and their resulting effects on the temperature distribution at th e melt free surface correlate well the changes in external crystal mor phology and provide a mechanistic explanation for the experimental res ults. (C) 1998 Elsevier Science B.V. All rights reserved.