首页 | 本学科首页   官方微博 | 高级检索  
     

声光晶体TeO2的生长及缺陷研究
引用本文:季小红,桑文斌,刘冬华,李冬梅,钱永彪,史伟民,闵嘉华. 声光晶体TeO2的生长及缺陷研究[J]. 人工晶体学报, 2001, 30(1): 93-98
作者姓名:季小红  桑文斌  刘冬华  李冬梅  钱永彪  史伟民  闵嘉华
作者单位:上海大学嘉定校区电子信息材料系,
摘    要:本文研究了直接TeO2晶体中的主要晶体缺陷形成机理,讨论分析了T eO2单晶生长的工艺参数对晶体缺陷的影响,结果表明:晶体裂缝的主要与温度梯度有关,温度梯度大于20-25℃/cm及出现界面翻转时,易造成晶全的开裂,位错密度增加,晶体中的包裹体主要为气态包裹全,它的形成主要与籽晶的转速和晶体的提拉速率有关,转速15-18r/min,拉速0.55mm/h,固液界面微凹,可以减少晶体中的气态包裹体,晶体台阶由晶体生长过程中温度和生长速度的引起伏引起,当台阶间距较宽时,易形成包裹体。

关 键 词:声光晶体 氧化碲晶体 晶体缺陷 工艺参数 单晶生长 直拉法
文章编号:1000-985X(2001)01-0093-06
修稿时间:2000-08-01

Study on CzochralskiGrowth of TeO2 Single Crystal and Defects
JI Xiao-hong,SANG Wen-bin,LIU Dong-hua,LI Dong-mei,QIAN Yong-biao,SHI Wei-min,MIN Jia-hua. Study on CzochralskiGrowth of TeO2 Single Crystal and Defects[J]. Journal of Synthetic Crystals, 2001, 30(1): 93-98
Authors:JI Xiao-hong  SANG Wen-bin  LIU Dong-hua  LI Dong-mei  QIAN Yong-biao  SHI Wei-min  MIN Jia-hua
Abstract:The formation mechanism of main defects in TeO2 single crystals grown by Czochralski technique and the effects of growth parameters on defects have been studied in this paper.The results showed that the cracking in TeO2 single crystal is mainly related to the temperature gradient.To avoid the crystal being cracked and to decrease the dislocation density,the crystal can be grown under temperature gradient of 20-25℃/cm.And the incorporation of gas inclusions into the crystal is due to the pulling rate and the seed rotation rate.The crystal without bubbles can be obtained when a rotation rate of 15-18r/min and a pulling rate of 0.55mm/h are employed,which can lead a concave solid-liquid interface.The reason for growth steps in crystal can be explained by the instability of temperature and growth speed during growth process.
Keywords:
本文献已被 维普 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号