TITLE

High-resolution electron microscopy of the c=30.5 Ã… and c=38.2 Ã… polytypoids in the Bi-Ca-Sr-Cu-O superconductor

AUTHOR(S)
Hetherington, C. J. D.; Ramesh, R.; O’Keefe, M. A.; Kilaas, R.; Thomas, G.; Green, S. M.; Luo, H. L.
PUB. DATE
September 1988
SOURCE
Applied Physics Letters;9/12/1988, Vol. 53 Issue 11, p1016
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report results of high-resolution structure imaging, image processing, and simulation of the c = 30.5 Ã… (T[sub c] = 80 K) and c = 38.2 Ã… (T[sub c] = 115 K) superconducting polytypoids in the BiCa-Sr-Cu-O system. The increase in c parameter is due to the insertion of two layers of Cu-O perovskite +Ca atoms in each unit cell. From the processed image and simulations, it appears that the central Cu layer in the c = 38.2 Ã… polytypoid may be oxygen deficient. In addition, the image simulation experiments suggest that the oxygen atoms in the Bi-O layers are located at the face center of the Bi lattice.
ACCESSION #
9828037

 

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