Structure and Composition Analysis of High-Tc Superconducting Bi-Ca-Sr-Cu-O Oxide by High-Resolution Analytical Electron Microscopy
Structure and Composition Analysis of High-Tc Superconducting Bi-Ca-Sr-Cu-O Oxide by High-Resolution Analytical Electron Microscopy
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高分辨率分析电子显微镜分析高温超导 Bi-Ca-Sr-Cu-O 氧化物的结构和成分
DOI：
10.1143/jjap.27.l358
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发表时间：
1988
影响因子：
1.5
通讯作者：
M. Yokoyama
中科院分区：
文献类型：
--
作者：
Y. Bando;T. Kijima;Y. Kitami;J. Tanaka;F. Izumi;M. Yokoyama
利用400 kV高分辨率分析电子显微镜，采用晶体结构成像和显微光谱分析相结合的方法，研究了高tc约为75 K的Bi-Ca-Sr-Cu-O氧化物的化学组成和晶体结构。晶体为正交晶型，晶格参数a=0.54 nm, b=2.70 nm, c=3.06 nm。化学成分为Bi2CaxSrzCu2Oy，其中x和z分别约为1.0和1.5。结构图像显示该结构由氧化铋层与缺氧钙钛矿样层交织而成。认为形成了以钙钛矿型结构为基础的近似相称的上部结构。
The chemical composition and the crystal structure of the Bi-Ca-Sr-Cu-O oxide with a high-Tc of about 75 K have been studied by the combined techniques of crystal structure imaging and spectroscopic microanalysis using a 400 kV high-resolution analytical electron microscope. The crystal is orthorhombic with lattice parameters a=0.54 nm, b=2.70 nm and c=3.06 nm. The chemical composition is assigned as Bi2CaxSrzCu2Oy, where x and z are approximately 1.0 and 1.5, respectively. The structure image reveals that the structure is comprised of a bismuth oxide layer interleaved with an oxygen deficient perovskite-like layer. It is suggested that a nearly commensurate superstructure based on the perovskite-type structure is formed.