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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Andersen, L.G. Poulsen, H.F. Frello, T. Andersen, N.H. von Zimmermann, M. |
| Copyright Year | 2002 |
| Abstract | The phase transformations taking place during cooling of BSCCO/Ag tapes have been investigated by means of high energy X-ray diffraction at a synchrotron source. This technique allows in-situ measurements of the concentration changes of the major structural phases, including liquids. In addition, information is obtained on stoichiometry and texture variations. Two mono-filament tapes were studied in air. The first tape was cooled at a constant rate of 50/spl deg/C/h. At temperatures above 730/spl deg/C the (Ca,Sr)/sub 2/CuO/sub 3/ and liquid phases are almost completely converted to 2212 and 2223. Below 780/spl deg/C a Pb-rich phase appears, either 3221 or (Ca,Sr)/sub 2/PbO/sub 4/. Simultaneously, shifts of X-ray lines indicate that 2223 is deprived of Pb, and from 730/spl deg/C onwards the concentration of 2223 drops. The second tape was cooled in steps to sequentially lower temperatures: 845/spl deg/C, 820/spl deg/C and 660/spl deg/C. At the former two steps (Ca,Sr)/sub 2/CuO/sub 3/ and liquid phases are again converted to 2212 and 2223, while at 660/spl deg/C they are rapidly converted to 2212 and-primarily-2201. Also at 660/spl deg/C, 2223 decomposes to 3221 or (Ca,Sr)/sub 2/PbO/sub 4/ at a rate of 40% per hour. |
| Sponsorship | Council on Superconductivity Appl. Superconductivity Conference Inc MIT |
| Starting Page | 2758 |
| Ending Page | 2761 |
| Page Count | 4 |
| File Size | 400203 |
| File Format | |
| ISSN | 10518223 |
| Volume Number | 9 |
| Issue Number | 2 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1999-06-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Cooling Bismuth compounds Temperature Annealing Grain size Heat treatment Grain boundaries X-rays Capacitive sensors Charge coupled devices |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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