Back to Search
Start Over
Enhanced I/sub c/-B performance in Tl-base high-Te oxides prepared by a diffusion process.
- Source :
-
IEEE Transactions on Applied Superconductivity . 1997, Vol. 7 Issue 2, p1957-1960. 4p. - Publication Year :
- 1997
-
Abstract
- High-T/sub c/ Tl-base oxides can be synthesized by a diffusion reaction within a short reaction time. The F addition apparently promotes the phase transformation from 2223 to 1223. The scanning electron microscope observation reveals that the 1223 phase formed by the F addition shows a dense and homogeneous structure, resulting in an increase in transport I/sub c/ at 77 K. Moreover, F addition significantly improves the I/sub c/ at 77 K under magnetic field, and shifts the irreversibility line to higher temperature. Meanwhile, V addition was found to enhance the diffusion reaction, resulting in the formation of 2223 layer of about 600 pm in thickness after the reaction at 850/spl deg/C for 2 h. The V is pushed out from the diffusion layer and accumulates on the surface of the specimen. The V addition causes almost no degradation in T/sub c/. I/sub c/-B performance is appreciably improved by annealing in O/sub 2/ after the reaction. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 10518223
- Volume :
- 7
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Applied Superconductivity
- Publication Type :
- Academic Journal
- Accession number :
- 93047206
- Full Text :
- https://doi.org/10.1109/77.620970