R. Schumaker, V.Y. Lee, et al.
Journal of Organic Chemistry
We have investigated the crystallography and microstructure of Y 1Ba2Cu3O9-x with transmission electron microscopy and x-ray diffraction. Y1Ba2Cu 3O9-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.
R. Schumaker, V.Y. Lee, et al.
Journal of Organic Chemistry
E.M. Engler, B.A. Scott, et al.
JACS
R. Beyers, B.T. Ahn, et al.
Nature
T.C. Huang, G. Lim, et al.
JVSTA