NDLI: Origin of J/sub c/ lateral spatial distribution in Ag-sheathed Bi-2212 HTSC tapes

Content Provider	IEEE Xplore Digital Library
Author	Pan, A.V. Ionescu, M.H. Dou, S.X.
Copyright Year	2002
Abstract	Critical current density (J/sub c/) spatial distribution in the superconducting core of the Ag-sheathed Bi-2212 tapes prepared by "powder in tube" technique has been measured by means of tape cutting along the rolling direction to a few narrow strips and separate J/sub c/ measurements each of them. The J/sub c/ value on the edges of tapes has been found to be higher by a factor of about 3 in comparison with the central area. Unexpectedly, the measured oxide core density is shown to be in contrary the lowest in the edge regions. The thin interface layer (about 10 /spl mu/m thick) with no secondary phase has been observed by SEM on the whole circumference of Ag-sheath/core boundary. This interface layer is assumed to be responsible for the dominant contribution to the supercurrent-carrying ability of a tape. However, in fact the J/sub c/-values on the very edge of the core still are twice as high as J/sub c/ in the central region (3.6/spl times/10/sup 4/ against 1.8/spl times/10/sup 4/ A/cm/sup 2/). Thus, an optimal structure formation can be promoted by the core edge geometry.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1331
Ending Page	1334
Page Count	4
File Size	595025
File Format	PDF
ISSN	10518223
Volume Number	7
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-06-01
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 films Microstructure Strips Silver Powders Superconducting epitaxial layers Impurities Hydrodynamics Heat treatment Critical current density
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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