An X-Ray Diffraction and Electron Microscopic Study of a New High-Tc Superconductor based on the Bi-Ca-Sr-Cu-O System
- 1 April 1988
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 27 (4A) , L569
- https://doi.org/10.1143/jjap.27.l569
Abstract
Observed high-resolution images of a new high-T c superconductor based on the Bi-Ca-Sr-Cu-O system (T c above 70 K) indicated a structure derived from the Bi4Ti3O12 type in which doubled bismuth oxide layers alternate with double perovskite layers along the c-axis. The orthorhombic unit cell dimensions showed an approximate relation of a=√2a p, b=5√2a p and c=8a p, where a p=3.82 Å, the cell parameter of a cubic perovskite. At least a quarter of the oxygen should be deleted in accordance with the average copper valence of less than 3 and two-dimensional Cu-O layers are supposed to be responsible for the high-T c superconductivity.Keywords
This publication has 3 references indexed in Scilit:
- A New High-Tc Oxide Superconductor without a Rare Earth ElementJapanese Journal of Applied Physics, 1988
- Superconductivity in the Bi - Sr - Cu - O systemZeitschrift für Physik B Condensed Matter, 1987
- Superconductivity in the Bi-Sr-Cu-O SystemJapanese Journal of Applied Physics, 1987