Active control of interface shape during the crystal growth of lead bromide

A thermal model for predicting and designing the furnace temperature profil e was developed and used for the crystal growth of lead bromide. The model gives the ampoule temperature as a function of the furnace temperature, the rmal conductivity, heat transfer coefficients, and dimensions as variable p arameters. Crystal interface curvature was derived from the model and it wa s compared with the predicted curvature for a particular furnace temperatur e and growth parameters. Large crystals of lead bromide were grown and it w as observed that interface shape was in agreement with the shape predicted by this model. (C) 1999 Published by Elsevier Science B.V. All rights reser ved.