Significantly enhanced critical current density in Ag-sheathed (Bi,Pb)[sub 2]Sr[sub 2]Ca[sub 2]Cu[sub 3]O[sub x] composite conductors prepared by overpressure processing in final heat treatment

Yuan, Y.; Jiang, J.; Cai, X. Y.; Larbalestier, D. C.; Hellstrom, E. E.; Huang, Y.; Parrella, R.
March 2004
Applied Physics Letters;3/22/2004, Vol. 84 Issue 12, p2127
Academic Journal
Overpressure (OP) processing otherwise fully treated, commercial Ag-sheathed multifilament (Bi,Pb)[sub 2]Sr[sub 2]Ca[sub 2]Cu[sub 3]O[sub x] (2223) composite conductors increased the critical current density J[sub c] (0.1 T, 77 K) by 37% to 30.8 kA/cm[sup 2] and the self-field J[sub c] (SF, 77 K) to 69.6 kA/cm[sup 2]. These improvements were obtained on full-size high current conductors such that critical current I[sub c] (0.1 T, 77 K) reached 80.6 A and I[sub c] (SF, 77 K) 181.7 A, even though there was a very strong self-field suppression of I[sub c]. Estimated values for the non-self-field-limited I[sub c] and J[sub c] (0 T, 77 K) reached 235 A and 90 kA/cm[sup 2]. Scanning electron microscopy and superconducting quantum inference device measurement revealed that OP processing effectively suppressed cracks, porosity, and the volume fraction of the Bi[sub 2]Sr[sub 2]Ca[sub 1]Cu[sub 2]O[sub y] (2212) phase, which are all major current-limiting mechanisms in present 2223 conductors. © 2004 American Institute of Physics.


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