Bi_2Sr_2CaCu_2O_y单晶调制结构的X射线衍射研究  

X RAY DIFFRACTION STUDY OF THE MODULATED STRUCTURE IN Bi 2Sr 2CaCu 2O y SINGLE CRYSTALS

作　　者：徐政[1,2] 赵小如[1,2] 吴文彬[2] 孙学峰[2] 汪良斌[2] 周贵恩[2] 李晓光[2] 张裕恒 

机构地区：[1]同济大学材料科学与工程系 [2]中国科学技术大学结构分析开放研究实验室

出　　处：《物理学报》1996年第9期1578-1585,共8页Acta Physica Sinica

基　　金：国家杰出青年科学基金

摘　　要：用Ｘ射线转靶衍射仪，详细地观察和分析了Ｂｉ２Ｓｒ２ＣａＣｕ２Ｏｙ单晶的调制结构．指出布喇格反射的卫星峰是沿ｃ拉长的，与Ｂ心正交对称结构不相符的宽化峰正是由于这种拉长的结果，且导致卫星峰强度的不对称性．ＢｉＯ层和钙钛矿层晶格失配形成的超晶格为非正交而是单斜的。The modulated structure of Bi 2Sr 2CaCu 2O y single crystals has been observed and studied in detail with an X ray rotating anode diffractometer,indicating that the satellites of Bragg reflections are stretched along the c * direction in reciprocial space.It is the result of the stretch that the widened peaks are incompatible with a B centered orthorhombic Bravais lattice,and the intensities of satellites become asymmetry. The superlattice based on the lattice mismatch is not orthorhombic but monoclinic and perhaps forms superlattice twin structure in Bi 2212 single crystals.

关 键 词：BSCCO 超导体 单晶调制结构 X衍射 

分 类 号：TM262[一般工业技术—材料科学与工程]