Crystallography and microstructure of Y1Ba2Cu3O9−x, a perovskite-based superconducting oxide
- 29 June 1987
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 50 (26), 1918-1920
- https://doi.org/10.1063/1.97686
Abstract
We have investigated the crystallography and microstructure of Y1Ba2Cu3O9−x with transmission electron microscopy and x‐ray diffraction. Y1Ba2Cu3O9−x is a distorted, oxygen‐defect perovskite with ordering of the yttrium and barium ions. Its unit cell is orthorhombic with space group Pmm2 and lattice parameters a=3.893 Å, b=11.688 Å, and c=3.820 Å. The structure is heavily twinned on {101} type planes, possibly due to a tetragonal‐to‐orthorhombic transition above room temperature.Keywords
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