单畴YBCO大块超导体表面生长十字花纹的观察及分析  

OBSERVATION AND ANALYSIS OF THE TOP SURFACE MORPHOLOGY OF SINGLE DOMAIN YBCO BULK SUPERCONDUCTORS

作　　者：杨万民[1] 周廉[1] 冯勇[1] 张平祥[1] 汪京荣[1] 张翠萍[1] 于泽铭[1] 唐晓东[1] 吴晓祖[1] 

机构地区：[1]西北有色金属研究院,西安710016

出　　处：《低温物理学报》1999年第5期351-354,共4页Low Temperature Physical Letters

摘　　要：本文通过大量的实验，借助ＳＥＭ 及ＥＤＡＸ分析，仔细观察了高质量单畴ＹＢＣＯ大块超导体表面生长花纹及其生长十字线的形貌，弄清了该类晶体表面花纹的形成原因．ａｂ 面沿水平方向生长样品表面的十字花纹，是由于在籽晶基础上沿ａｂ 面外延生长出来的相互垂直的两个１２３ 晶体相互生长碰撞，在其对角线上形成相遇时的痕迹所致，并提出了相应的晶体生长模型。The morphology of the across traces on the top surface of single domain YBCO bulk samples have been clearly revealed, the morphology of the across trace is closely related with the growth style and the anisotropy of the growth rate between a (or b ) axis and c axis. It is found that there are many fish scale like YBCO layers well connected each other on the top surface of the samples. In this sample the c axis is normal to the top surface, which indicates that YBCO crystal starts to grow from the center to the edge along a (or b )axis in all the four regions divided by across traces, and so the traces are forming a 90°angle when the four regions meet each other, and the clear traces are formed just because of the slightly difference in height of YBCO crystal between adjacent region.

关 键 词：表面生长花纹 YBCO 超导体 单畴 

分 类 号：TM262.014[一般工业技术—材料科学与工程]