NDLI: Transport, Magnetic, and SEM Characterization of a Novel Design Bi-2212 Strand

Content Provider	IEEE Xplore Digital Library
Author	Myers, C.S. Susner, M.A. Motowidlo, L. Distin, J. Sumption, M.D. Collings, E.W.
Copyright Year	2002
Abstract	In this work, a new strand design for Bi-2212 conductors was studied. The new design had a single stack approach with randomly oriented but densely packed two-dimensional Bi-2212 filaments. This Bi-2212 Two-Dimensional Random-Oriented Single-Stack (2D-ROSS) Round Wire design led to high levels of grain texture and significant amounts of Ag-superconductor interface within the filaments, while maintaining a high strand fill factor. This new design was compared to a strand made with a conventional billet layout. Heat treatments were performed under 100% flowing oxygen, and the samples were melt processed at 884, 886, 888, and 89°C. The strands were studied via transport, magnetic, and electron optics techniques. The strands manufactured with the new process showed higher critical currents than the standard design strands in terms of engineering critical current density (J_e) but slightly lower layer critical current density (J_c). However both strand sets were limited by filament sizes which were not yet optimized and excessive C-content in the powders. J_e values of 48 A/mm² for the new strand design, and 26 A/mm² for the conventional double stack design, at 12 T and 4.2 K were observed. An interesting property of the new strand method was that the strands were less sensitive to small heat treatment, HT, temperature variations in terms of their final J_c properties. Magnetic and microstructure/phase assemblage studies observed less filament bridging in the new strand design as compared to the conventional one.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2804
Ending Page	2807
Page Count	4
File Size	1857687
File Format	PDF
ISSN	10518223
Volume Number	21
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Superconducting magnets Wire Temperature measurement Critical current density Conductors High temperature superconductors superconducting filaments and wires Bi2212 critical current density high-temperature superconductors
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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