Defect structure of superconducting YBa2Cu3O7−δ
- 1 March 1988
- journal article
- review article
- Published by Wiley in Journal of Electron Microscopy Technique
- Vol. 8 (3) , 285-295
- https://doi.org/10.1002/jemt.1060080307
Abstract
The superconducting material Y1Ba2Cu3O7−δ has been investigated by electron microscopy. Special attention has been paid to the defects occurring in the material. Twinning on (110) or (110) planes is intrinsically related to the orthorhombicity, and when cooled slowly the twin bands are pseudoperiodic with an average width of ˜ 50 nm. The orthorhombic‐tetragonal transition is reversible and diffusion controlled. Under particular conditions and in slightly reduced material a 2a0 X b0 superstructure resulting from vacancy ordering is formed. When kept in air under powder form the material seems to be unstable. Planar defects along (001) accompany the degeneration of the material.Keywords
This publication has 14 references indexed in Scilit:
- Surface decomposition of superconducting YBa2Cu3O7Physica Status Solidi (a), 1988
- Electron Diffraction and Electron Microscopy of the Superconducting Compound Ba2YCu3O7–δPhysica Status Solidi (a), 1987
- Direct Observation of the Order-Disorder Transformation of the Oxygen Sublattice of Ba2YCu3O7-δPhysica Status Solidi (a), 1987
- Heavy atom disorder in the high Tc superconductor Ba2YCu3O7−δ studied by means of electron microscopy and electron diffractionSolid State Communications, 1987
- Crystal structure of Ba2YCu3−xO7−y, a superconductive compound determined by X-ray single crystal diffraction methodMaterials Research Bulletin, 1987
- The vacancy order — disorder transition in Ba2YCu3O7−δ observed by means of electron diffraction and electron microscopySolid State Communications, 1987
- Structure of the 100 K Superconductor Ba 2 YCu 3 O 7 between (5 ÷ 300) K by Neutron Powder DiffractionEurophysics Letters, 1987
- Crystallographic description of phases in the Y-Ba-Cu-O superconductorPhysical Review B, 1987
- Superconductivity above 90 K in the compound : Structural, transport, and magnetic propertiesPhysical Review B, 1987
- Bulk superconductivity at 91 K in single-phase oxygen-deficient perovskitePhysical Review Letters, 1987