Optimisation of thallium “1223” high-temperature superconducting wire by a single-state cold deformation process
✍ Scribed by B.A. Glowacki; S.R. Ashworth
- Book ID
- 103945680
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 659 KB
- Volume
- 200
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
Superconducting tapes containing (Tlo.sPbo.5)Sr2Ca2Cu309 were manufactured by a powder-in-tube technique and a single annealing stage. The (Tlo.sPbo.5)Sr2Ca2CuaO9 forms a "1223" structure with a Tc of over 120 K. A cold pressing stage was found to be necessary to achieve the higher Jc values at 77 K, The transport J~ was found to depend on: the annealing temperature, annealing time and pressing pressure. SEM examination of the TI-1223 grain structure showed a marked difference between rolled and pressed tapes. This is ascribed to the production of a lead-rich phase during pressing, this is supported by XRD evidence. No significant degree of grain alignment was found in the TI-1223 tapes, either by XRD analysis or by the measurement of transport critical current in applied magnetic fields.