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

Beyers, R.; Lim, G.; Engler, E. M.; Savoy, R. J.; Shaw, T. M.; Dinger, T. R.; Gallagher, W. J.; Sandstrom, R. L.
June 1987
Applied Physics Letters;6/29/1987, Vol. 50 Issue 26, p1918
Academic Journal
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 Ã…, b=11.688 Ã…, and c=3.820 Ã…. The structure is heavily twinned on {101} type planes, possibly due to a tetragonal-to-orthorhombic transition above room temperature.


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