Evidence for length-dependent wire expansion, filament dedensification and consequent degradation of critical current density in Ag-alloy sheathed Bi-2212 wires (Articolo in rivista)

Type
Label
  • Evidence for length-dependent wire expansion, filament dedensification and consequent degradation of critical current density in Ag-alloy sheathed Bi-2212 wires (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0953-2048/26/5/055018 (literal)
Alternative label
  • Malagoli, A.ab , Lee, P.J.a, Ghosh, A.K.c, Scheuerlein, C.d, Di Michiel, M.e, Jiang, J.a, Trociewitz, U.P.a, Hellstrom, E.E.a, Larbalestier, D.C.a (2013)
    Evidence for length-dependent wire expansion, filament dedensification and consequent degradation of critical current density in Ag-alloy sheathed Bi-2212 wires
    in Superconductor science and technology (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Malagoli, A.ab , Lee, P.J.a, Ghosh, A.K.c, Scheuerlein, C.d, Di Michiel, M.e, Jiang, J.a, Trociewitz, U.P.a, Hellstrom, E.E.a, Larbalestier, D.C.a (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.scopus.com/inward/record.url?eid=2-s2.0-84876562279&partnerID=q2rCbXpz (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 26 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 5 (literal)
Note
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • a Applied Superconductivity Center, National High Magnetic Field Laboratory, 2031 E Paul Dirac Dr, Tallahassee, FL 32310, United States b CNR-SPIN, Corso Perrone 24, I-16152, Genova, Italy c Brookhaven National Laboratory, Upton, NY 11973, United States d European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland e European Synchrotron Radiation Facility (ESRF), 6 rue Jules Horowitz, F-38043 Grenoble, France (literal)
Titolo
  • Evidence for length-dependent wire expansion, filament dedensification and consequent degradation of critical current density in Ag-alloy sheathed Bi-2212 wires (literal)
Abstract
  • It is well known that longer Bi-2212 conductors have significantly lower critical current density (Jc) than shorter ones, and recently it has become clear that a major cause of this reduction is internal gas pressure generated during heat treatment, which expands the wire diameter and dedensifies the Bi-2212 filaments. Here we report on the length-dependent expansion of 5-240 cm lengths of state-of-the-art, commercial Ag alloy sheathed Bi-2212 wire after full and some partial heat treatments. Detailed image analysis along the wire length shows that the wire diameter increases with distance from the ends, longer samples often showing evident damage and leaks provoked by the internal gas pressure. Comparison of heat treatments carried out just below the melting point and with the usual melt process makes it clear that melting is crucial to developing high internal pressure. The decay of Jc away from the ends is directly correlated to the local wire diameter increase, which decreases the local Bi-2212 filament mass density and lowers Jc, often by well over 50%. It is clear that control of the internal gas pressure is crucial to attaining the full Jc of these very promising round wires and that the very variable properties of Bi-2212 wires are due to the fact that this internal gas pressure has so far not been well controlled. © 2013 IOP Publishing Ltd. (literal)
Prodotto di
Autore CNR

Incoming links:


Autore CNR di
Prodotto
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi
data.CNR.it