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Crystallography and microstructure of Y1Ba2Cu3O9−x, a perovskite‐based superconducting oxide

 

作者: R. Beyers,   G. Lim,   E. M. Engler,   R. J. Savoy,   T. M. Shaw,   T. R. Dinger,   W. J. Gallagher,   R. L. Sandstrom,  

 

期刊: Applied Physics Letters  （AIP Available online 1987）
卷期: Volume 50, issue 26  

页码: 1918-1920

 

ISSN:0003-6951

 

年代: 1987

 

DOI:10.1063/1.97686

 

出版商: AIP

 

数据来源: AIP

 

摘要:

We have investigated the crystallography and microstructure of Y1Ba2Cu3O9−xwith transmission electron microscopy and x‐ray diffraction. Y1Ba2Cu3O9−xis a distorted, oxygen‐defect perovskite with ordering of the yttrium and barium ions. Its unit cell is orthorhombic with space groupPmm2 and lattice parametersa=3.893 A˚,b=11.688 A˚, andc=3.820 A˚. The structure is heavily twinned on {101} type planes, possibly due to a tetragonal‐to‐orthorhombic transition above room temperature.

 

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