Paper Title:
Magnetic Nanoparticles as Pinning Center in Bi-Sr-Ca-Cu-O/Ag Superconductor Tapes
  Abstract

This paper reports on the effectiveness of magnetic nanoparticles as pinning center in the Bi-based superconductor tapes. Nanosize γ-Fe2O3 and ultrafine Fe3O4 have been employed to enhance the transport current density of Ag-sheathed-(Bi1.6Pb0.4)Sr2Ca2Cu3O10 superconductor tapes prepared by the powder-in-tube technique. The transport critical current density, Jc of (Bi1.6Pb0.4)Sr2Ca2Cu3O10-(γ-Fe2O3)0.01, sintered at the optimum temperature of 845 oC is 6490 A/cm2 when measured at 77 K. A further single intermediate rolling step increases Jc to 9560 A/cm2. Samples without γ-Fe2O3 prepared under the same condition showed a lower Jc with a maximum of 1560 A/cm2. Similar results are also obtained for ultrafine Fe3O4. Magnetic impurities generally suppress superconductivity. However, our study shows great promise of magnetic nanorod γ-Fe2O3 and ultrafine Fe3O4 as novel pinning centers in enhancing the transport critical density of Ag sheathed Bi-Sr-Ca-Cu-O superconductor tapes. This is in line with previous calculations on frozen flux superconductor with magnetic nanoparticle as pinning centers.

  Info
Periodical
Edited by
A.K. Arof and S.A. Hashim Ali
Pages
212-216
DOI
10.4028/www.scientific.net/MSF.517.212
Citation
R. Abd-Shukor, S.Y. Yahya, "Magnetic Nanoparticles as Pinning Center in Bi-Sr-Ca-Cu-O/Ag Superconductor Tapes", Materials Science Forum, Vol. 517, pp. 212-216, 2006
Online since
June 2006
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Price
$32.00
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