High-resolution electron microscopy of high-temperature superconductors.
We review recent results obtained at Northwestern using high-resolution electron microscopy to study high-temperature superconductors. While in general these materials form large, very perfect single crystal grains which display very few imperfections, there is also evidence of slip defects, amorphous regions, and order-disorder transformations. We also report that the gadolinium-based superconductors and in one case yttrium-based superconductors show evidence for some copper solid solubility in the form of copper-rich planar defects. The structure of a metastable trigonal polytype is also reported, as are the effects of electron beam and water vapor damage to the materials.
Marks
L D
LD
Materials Research Center, Northwestern University, Evanston, Illinois 60208.
Li
D J
DJ
Shibahara
H
H
Zhang
J P
JP
D003461:Crystallography; D004553:Electric Conductivity; D006358:Hot Temperature; D008670:Metals / Q000032:analysis; D008854:Microscopy, Electron / Q000379:methods*
D008670:Metals