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Improvement of the critical current density of Bi-2223 tapes by introducing Ag layers inside individual filaments

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A novel method was developed to introduce Ag layers inside individual Bi-2223 filaments. The introduction of well-aligned double Ag layers leads to a significant improvement of the critical current density: the Jc value is about 60% higher than that for our standard tapes. The microstructure showed that highly aligned Bi-2223 grains formed not only along the external Ag sheath, but also along the additional internal Ag layers. Rocking curve measurements were performed both after etching and peeling of the Ag sheath in order to investigate the texturing in the surface and inside the filaments. Compared with that for our standard tape, the average grain misalignment degree in the tape with 2 × 2 additional Ag layers is about 1° narrower. Introducing Ag layers inside a filament also leads to a higher density of the precursor during the deformation.

Document Type: Research Article


Publication date: June 1, 2005

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