In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 28, No. 7R ( 1989-07-01), p. 1185-
Abstract:
The Bi–(Pb)–Sr–Ca–Cu–O superconductor has been fabricated into tapes without a sheath and into multifilamentary wires and tapes with a Ag sheath. Superconducting properties, workability, the possibility of forming the superconducting phase in a long wire, morphology, effects of compacting and effects of c -axis alignment, to name a few, have been studied. Tape specimens prepared by combination and repetition of cold work (or cold press) and sintering showed a critical current density, J c , as high as 5×10 3 A/cm 2 at 77 K with good reproducibility and reliability, although these specimens are sufficiently thick (0.5–1.0 mm). (Generally, J c , at the zero field is inversely proportional to thickness.) For these tape specimens (with Cu sheath), sintering and J c measurement were performed after the Cu sheath was removed. X-ray analysis showed that most of these tape specimens consisted purely of the high- T c phase (∼107 K). In these specimens, the c axis tended to align well. This c axis alignment may be a reason for the enhancement in J c . On the other hand, the tape specimens cold-worked and sintered only once showed J c as small as 10 2 A/cm 2 the c axis showing no sign of the c axis alignment. A 1330-filament Bi–Pb–Sr–Ca–Cu–O wire with a Ag sheath has been successfully fabricated. This multifilamentary wire shows a critical temperature, T c of ∼105 K. A multifilamentary tape specimen fabricated by a combination of cold working and sintering showed a J c of 1.05×10 3 A/cm 2 at 77 K.
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.28.1185
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
1989
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
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