Phase composition and local grain alignment at the Ag/superconductor interface in Ag-sheathed Bi-Sr-Ca-Cu-O tapes
| Autor: | David C. Larbalestier, Susan E. Babcock, Y. Feng, J.B. VanderSande |
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| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | Proceedings, annual meeting, Electron Microscopy Society of America. 51:1140-1141 |
| ISSN: | 2690-1315 0424-8201 |
| DOI: | 10.1017/s0424820100151532 |
| Popis: | Texturing of the superconductor phase and proximity to a sourse of silver appear to be crucial to the development of high critical current density tapes of the Bi-Sr-Ca-Cu-O (BSCCO) high-temperature superconductors, yet relatively little is understood about the mechanism(s) by which the [001] texture develops and the complex role that the silver sheath material plays. We have studied the phase composition, alignment, and bonding at the Ag/BSCCO interface for silver-sheathed tapes of both the 2212 and 2223 phases that have been processed under fundamentally different conditions. High-resolution TEM imaging revealed details of the interface that give insight into these important questions.Ag-sheathed BSCCO tapes with cation compositions Bi2Sr2CaCu2Ox (2212) and Bi1.8Pb0.4Sr2.0Ca2.2Cu3Ox (2223) were prepared by standard powder-in-tube methods. 2212 sample A was heat-treated at 920°C for 15 minutes to melt the superconductor core, then cooled at 240°C/h from 920°C to 840°C and annealed at 840°C for 70 hours. |
| Databáze: | OpenAIRE |
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