Melt texturing and thermomechanical processing of (Bi,Pb)-1212 superconductors
Abstract
The conditions of melt texturing of bulk (Bi,Pb)-1212 were improved by adaption of (i) the chemical composition of the precursor, (ii) the temperature/time schedule and (iii) the method of post-treatment. It is shown that especially an increase of the Ca and Pb content is suitable and well textured materials are obtained. In melt textured materials the best values are Tc, χ=94 K and jc, χ=7.8×10 5 A cm -2 (5 K, 0 T). However, thermomechanical processing has failed to induce a pronounced grain alignment in (Bi,Pb)-1212 PIT tapes and the superconducting properties are still dominated by weak intergrain superconducting couplings.
- Publication:
-
Physica C Superconductivity
- Pub Date:
- September 1998
- DOI:
- 10.1016/S0921-4534(98)00284-6
- Bibcode:
- 1998PhyC..306..119Z