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Origin of JC lateral spatial distribution in Ag-sheathed Bi-2212 HTSC tapes

Conference Paper


Abstract


  • Critical current density (JC) 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 JC measurements each of them. The JC 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 ��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 JC-values on the very edge of the core still are twice as high as JC in the central region (3.6��104 against 1.8��104 A/cm2). Thus, an optimal structure formation can be promoted by the core edge geometry. �� 1997 IEEE.

Publication Date


  • 1997

Citation


  • Pan, A. V., Ionescu, M. H., & Dou, S. X. (1997). Origin of JC lateral spatial distribution in Ag-sheathed Bi-2212 HTSC tapes. In IEEE Transactions on Applied Superconductivity Vol. 7 (pp. 1331-1334). doi:10.1109/77.620773

Scopus Eid


  • 2-s2.0-0031165314

Start Page


  • 1331

End Page


  • 1334

Volume


  • 7

Issue


  • 2 PART 2

Place Of Publication


Abstract


  • Critical current density (JC) 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 JC measurements each of them. The JC 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 ��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 JC-values on the very edge of the core still are twice as high as JC in the central region (3.6��104 against 1.8��104 A/cm2). Thus, an optimal structure formation can be promoted by the core edge geometry. �� 1997 IEEE.

Publication Date


  • 1997

Citation


  • Pan, A. V., Ionescu, M. H., & Dou, S. X. (1997). Origin of JC lateral spatial distribution in Ag-sheathed Bi-2212 HTSC tapes. In IEEE Transactions on Applied Superconductivity Vol. 7 (pp. 1331-1334). doi:10.1109/77.620773

Scopus Eid


  • 2-s2.0-0031165314

Start Page


  • 1331

End Page


  • 1334

Volume


  • 7

Issue


  • 2 PART 2

Place Of Publication