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Bismuth Silicate Crystal Grown by CZ Method and Its Shape Changes

Xu Xuewu Shen Bingfu Liao Jingying Chen Xianqou He Chongfan (Shanghai Institute of Ceramics,Chinese Academy of Sciences,200050)  
The bismuth silicate (BSO) crystals grown by CZ method arereported.The BSO crystals were pulled along 001,110,and 111 direc-tionswith diameters controlled automatically by the buoyant force balanceset-up.The size of BSO is (?)35×65mm.The proper pull rates were about2.5mm/h,the rotation rates were about 25~35r/min,and the verticaltemperature gradient (under the surface of melt,10mm) was about 50℃/Cm.The crystals grown under these conditions have good shapes and high quality.The habits of BSO-crystal grown along different directions have been discussed.The changes of crystal shapes during crystal growth according to the crystalstructure and crystal growth morphology are also analysed.It is suggested thatthe polar of 112 directions give rise to the changes of crystal shapes andone of the keys to produce large BSO crystals with high optical quality and high utilization ratio is to keep the crystals in good shapes during the crystal growth.
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