高温相偏硼酸钡(α-BaB_2O_4)晶体的缺陷行为分析  

Study on Defects of High Temperature Phase α-BaB_2O_4 Crystal

作　　者：李新军[1] 邹宇琦[2] 陈杏达[2] 徐军[2] 杨秋红[1] 田玉莲[3] 黄万霞[3] 

机构地区：[1]上海大学,上海201800 [2]中国科学院上海光学精密机械研究所,上海201800 [3]中国科学院北京高能物理研究所,北京100039

出　　处：《人工晶体学报》2002年第2期114-116,共3页Journal of Synthetic Crystals

基　　金：国家自然科学基金 (No .6 0 0 470 0 3)资助项目

摘　　要：运用同步辐射X射线白光形貌研究了α BaB2 O4 晶体内部的完整性 ,并分析了α BaB2 O4 晶体的缺陷行为及缺陷形成原因。在 (0 0 1)面发现生长扇界和亚晶界 ,而在 (10 0 )面和 (12 0 )面分别观察到了位错、位错簇以及针状包裹体。使用双晶衍射实验发现在 (0 0 1)面有生长条纹 ,这些生长条纹呈环形 ,该条纹与熔体中温度波动而导致的生长速率波动有关。运用白光形貌拍摄到高清晰的劳埃斑 。X-ray white-beam topography was used to investigate the structure and defects of α phase barium metaborate crystal(α-BaB 2O 4).Dislocations and inclusions were detected on (100) and (120) facets of α-BaB 2O 4 crystal,as well as grain boundary on (001) facet.Rocking curve was investigated and as-grown stripes were found to be orbicular.The cause of formation of the defects in α-BaB 2O 4 crystal was analyzed.Laue spots were clearly displayed by using X-ray white-beam topography,which confirmed that α-BaB 2O 4 crystal was rhombohedral structure.

关 键 词：高温相 偏硼酸钡 α-BaB2O4晶体 同步辐射白光X射线形貌术 双晶衍射 缺陷 

分 类 号：O771[理学—晶体学]