Bridgman growth of bismuth tellurite crystals

摘要

The growth of bismuth tellurite crystals by the vertical Bridgman method has been reported in this paper. The volatilization of melt is avoided by sealing the double-shell platinum crucibles and the cracking of crystals is decreased under smaller temperature gradients in the Bridgman furnace. By means of the optimum conditions such as stoichiometric feed materials, growth rate of 0.5-0.8 mm/h and the temperature gradient of 30-35 deg C/cm across the solid-liquid interface under the furnace temperature of 980-1000 deg C, the single crystals have been grown successfully by the vertical Bridgman method. This work proves that the vertical Bridgman process is promising to grow the high quality crystals with improved physical properties.