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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Folkerts, T.J. Dennis, K.W. Yoo, S.I. Xu, Y. Kramer, M.J. McCallum, R.W. |
| Copyright Year | 2002 |
| Abstract | Using a novel melt-spinning technique, the authors have produced both amorphous and nanocrystalline NdBa/sub 2/Cu/sub 3/O/sub 7-x/ and GdBa/sub 2/Cu/sub 3/O/sub 7-x/ materials. Samples melt-spun in O/sub 2/ consist of nanocrystals with the tetragonal 123 structure while those processed in N/sub 2/ show an amorphous matrix with small amounts of crystalline BaCu/sub 2/O/sub 2/, as shown by X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies. The difference is due to the strong dependence of the phase relations on the O/sub 2/ partial pressure. Superconductivity can be fully restored by heating above 1000 degrees C followed by a 450 degrees C anneal in O/sub 2/. High-temperature XRD studies show that the 123 phase crystallizes directly from the amorphous matrix below 800 degrees C. Restoration of the orthorhombic 123 phase does not necessarily ensure good superconducting properties, a result attributed to disorder on the heavy metal sites.< |
| Sponsorship | Council on Superconductivity Appl. Superconductivity Conference Inc MIT |
| Starting Page | 1150 |
| Ending Page | 1153 |
| Page Count | 4 |
| File Size | 653842 |
| File Format | |
| ISSN | 10518223 |
| Volume Number | 3 |
| Issue Number | 1 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1993-03-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Amorphous materials Crystallization X-ray scattering Crystalline materials Nanocrystals X-ray diffraction Transmission electron microscopy Superconductivity Heating Annealing |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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