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Processing, microstructure and irreversibility of large-grain Nd-Ba-Cu-O
| Content Provider | Scilit |
|---|---|
| Author | Cardwell, D. A. Babu, N. Hari Lo, W. Campbell, A. M. |
| Copyright Year | 2000 |
| Description | Journal: Superconductor Science and Technology The fabrication of Nd-Ba-Cu-O (NdBCO), which exhibits significant potential for high-field engineering applications, is extremely sensitive to firing atmosphere, undercooling and secondary phase content and presents considerably greater processing challenges than that of other (RE)BCO superconductors. A detailed study of NdBCO grain growth rate has been performed and a schematic process phase diagram constructed in the peritectic solidification region from isothermal growth experiments at various temperatures for several NdBCO compositions. This phase diagram has been used to fabricate large, single grains up to 2 cm in diameter of $NdBa_{2}Cu_{3}O_{7}$ (Nd-123) containing 15 mol% of non-superconducting $Nd_{4}Ba_{2}Cu_{2}O_{10}$ (Nd-422) phase inclusions using a top-seeded melt growth technique (TSMG) in reduced oxygen partial pressure. Magnetization measurements of samples cut from a large grain exhibit a pronounced peak effect over a wide temperature and field region and an anisotropic irreversibility line for fields applied parallel (≈9 T at 77 K) and perpendicular (extrapolates to greater than 40 T at 77 K) to the crystallographic c-axis. The temperature dependence of both the measured critical current density, $J_{c}$, and that associated with extrinsic pinning in this material has been observed to follow a power law above ≈70 K, suggesting that the density of pinning sites does not vary significantly with temperature. |
| Related Links | http://iopscience.iop.org/article/10.1088/0953-2048/13/6/304/pdf |
| Ending Page | 654 |
| Page Count | 9 |
| Starting Page | 646 |
| ISSN | 09532048 |
| e-ISSN | 13616668 |
| DOI | 10.1088/0953-2048/13/6/304 |
| Journal | Superconductor Science and Technology |
| Issue Number | 6 |
| Volume Number | 13 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2000-05-23 |
| Access Restriction | Open |
| Subject Keyword | Journal: Superconductor Science and Technology Metallurgy and Metallurgical Engineering |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ceramics and Composites Materials Chemistry Metals and Alloys Condensed Matter Physics Electrical and Electronic Engineering |
