Irreversibility behavior in Ag-sheathed Bi-based superconducting wires

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Irreversibility lines for Ag/(Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub y}(2223) wires prepared through a phase formation- decomposition-recovery (PFDR) process and normal annealing process were determined using both AC susceptibility measurements under DC fields and magnetisation measurements. It was found that flux pinning was enhanced in the PFDR processed samples over the normal processed samples, in particular at temperature above 77 K. The PFDR process results in high mass density, grain alignment, uniform distribution of impurity precipitates and high density of defects. The irreversibility temperatures scaled with the applied field according to H{sup 1/3}, which is in contrast to H{sup 2/3} law ... continued below

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Pages: (7 p)

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Dou, S.X.; Liu, H.K.; Guo, Y.C.; Wang, J.; Jin, X.J.; Hu, Q.Y. (New South Wales Univ., Kensington (Australia)) et al. April 1, 1992.

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Irreversibility lines for Ag/(Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub y}(2223) wires prepared through a phase formation- decomposition-recovery (PFDR) process and normal annealing process were determined using both AC susceptibility measurements under DC fields and magnetisation measurements. It was found that flux pinning was enhanced in the PFDR processed samples over the normal processed samples, in particular at temperature above 77 K. The PFDR process results in high mass density, grain alignment, uniform distribution of impurity precipitates and high density of defects. The irreversibility temperatures scaled with the applied field according to H{sup 1/3}, which is in contrast to H{sup 2/3} law for YBa{sub 2}Cu{sub 3}O{sub 7-x} and conventional superconductors. The irreversibility lines for PFDR processed tapes showed a crossover with those for normal processed tapes at temperature below {Tc} of the (Bi,Pb){sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+x} (2212), suggesting that at temperature above {Tc} of the 2212 phase, the 2212 as nonsuperconducting region, may serve as effective pinning sites for fluxoids.

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Pages: (7 p)

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OSTI; NTIS; GPO Dep.

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  • Material Research Society spring meeting, San Francisco, CA (United States), 27 Apr - 2 May 1992

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  • Other: DE92016698
  • Report No.: ANL/CP-76361
  • Report No.: CONF-920402--38
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 5100911
  • Archival Resource Key: ark:/67531/metadc1061256

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  • April 1, 1992

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  • Jan. 22, 2018, 7:23 a.m.

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  • Jan. 30, 2018, 1:09 p.m.

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Dou, S.X.; Liu, H.K.; Guo, Y.C.; Wang, J.; Jin, X.J.; Hu, Q.Y. (New South Wales Univ., Kensington (Australia)) et al. Irreversibility behavior in Ag-sheathed Bi-based superconducting wires, article, April 1, 1992; Illinois. (digital.library.unt.edu/ark:/67531/metadc1061256/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.