Growth of large Bi 2Sr 2CaCu 2O y single crystals by a modified vertical Bridgman method

Abstract

We prepared Bi 2Sr 2CaCu 2O y (Bi-2212) single crystals by a modified vertical Bridgman method, where the single crystals were grown rotating crucibles. We investigated the dependences of crystal growth on the temperature gradients at the growth region, the starting temperatures of growth ( T s) and the rotation speeds of the crucibles. When the Bi-2212 single crystals were grown under the temperature gradient of around 4.0°C/mm, the T s of more than 975°C and the rotation speed of about 25 rpm, large plate-like Bi-2212 single crystals with good crystallinity were obtained.