E.M. Engler, V.Y. Lee, et al.
JACS
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.
E.M. Engler, V.Y. Lee, et al.
JACS
L.J. Azevedo, J.E. Schirber, et al.
Physica B+C
C.-H. Kiang, M.S. Dresselhaus, et al.
Chemical Physics Letters
H.B. Brom, T.D. Schultz, et al.
Physical Review B