Growht and defects in YbxY1—xAl3（BO3）4 crystals

• 作者: HongLiu JingLi JiyangWang ShanrongZhao ShushengJiang XiaoboHu
• 来源期刊: 北京同步辐射装置：英文版
• 学科: 物理学
• 关键词: YbxY1-xAl3(BO3)4晶体 晶体生长 结构缺陷 硼酸盐晶体 形貌学 X射线
• 年，卷（期）: 2001,（2）
• 页码范围: 126-130
• 页数: 0页
• 分类号: O766.3

摘要

YbxY1-xAl3(BO3)4(x=0.1,0.07 and 0)crystals have been grown by the flux method.The growth defects of YbxY1-xAl3(BO3)4 crystals were detected by X-ray topography.It is found that the perfcetion of YbYAB crystal with low Yb dopant is better than that with high Yb dopant.In Yb0.1Y0.9Al3(BO3)4 crystal,growht bands,growth boundaries,grown-in dislocations and inclusions were observed.Howver,the densities of growth defects for Yb0.07Y0.93Al3(BO3)4 and YAl3(BO3)4 are low and no obvious inclusions are observed in these crytals.In addition,growth twins wrer detected in YbxY1-xAl3(BO3)4 crystal by using the chemical etching method.It is found that the growth twins occur frequently in Yb0.01Y0.9Al3(BO3)4 crystal whereas no growth twin appears in YAl3(BO3)4 crystal. Based on the experimental observations,the formation mechanism of growth twins is discussed.In the meantime,the effective measures for reducing the growth twins and defects are proposed.2001 Elsevier Science B.V.All rights reserved.