Ag-sheathed tapes produced with prereacted Bi2223 powder: critical currents and impurity phase development
- 1 October 1993
- journal article
- Published by IOP Publishing in Superconductor Science and Technology
- Vol. 6 (10) , 721-724
- https://doi.org/10.1088/0953-2048/6/10/003
Abstract
We have performed investigations of phase coexistence and critical current density on tapes of (Bi, Pb)2Sr2Ca2Cu3Ox (2223) with a silver sheath, produced by the powder-in-tube method. The powder used was prereacted 2223 phase (with mainly 2212 impurities). It was found that the 2201 phase is formed (and the 2212 phase disappears) at 840 degrees C in an Ag sheath, indicating that a different phase equilibrium may exist with and without the Ag sheath. Post-annealing at T<830 degrees C leads to a reappearance of the 2212 phase while the 2201 phase disappears. Transport critical current densities (77 K, self-field) are zero for tapes quenched from 840 degrees C. For tapes post-annealed at lower temperatures it appears as if all of the current is carried in links of 2212 (and not 2223) created between 2223 grains.Keywords
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