Abstract
Fabrication of Tl-1223 conductors in two geometries is reported. Powder-in-tube (PIT) tapes were fabricated using aerosol generated precursor powders mixed with TI2O3. Effect of processing variables such as temperature, time and uniaxial pressure were studied. Under optimum processing conditions the tapes have sharp transitions (widths ~1K) and zero-field Jc ~0.9x104A/cm2 at 77K. However the tapes lack any detectable grain orientation texture and are severely weak-linked. On the other hand, thick films (3-30µm) of Tl-1223 on Ag made using a variety of precursor deposition techniques followed by thallination in a two-zone flow reactor, show significantly reduced weak-link behavior and high zero-field Jc's (>104A/cm2). It is found that these films are c-axis aligned (rocking curve FWHM - 3-11°) and also possess varying degrees of local in-plane texture. Microstructural development in these thick films is found to be similar to that observed previously for films on polycrystalline YSZ. Such thick films present a working model of a practical Tl-1223 conductor.
| Original language | English |
|---|---|
| Pages (from-to) | 1405-1408 |
| Number of pages | 4 |
| Journal | IEEE Transactions on Applied Superconductivity |
| Volume | 5 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jun 1995 |
| Externally published | Yes |
Funding
Manuscript received October 17, 1994. This research was sponsored by the Division of Materials Sciences, Office of Basic Energy Sciences, US Department of Energy Office of Advanced Utility Concepts Superconducting Technology Program under contract DE-AC05-840R21400.