Properties of seven-filament Cu/Ag-sheathed (Ba,K)Fe2As2 tapes fabricated from round and square wires

Zhen Kun Jin, Cong Liu, Chao Yao, Liu Li, He Huang, Dong Liang Wang, Chi Heng Dong, Kai Wang, Xian Ping Zhang, Satoshi Awaji, Yan Wei Ma

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Iron-based superconductor, a promising candidate for high-field applications, has attracted significant attentions. For practical utilization, the superconducting tapes should have high transport critical current density (Jc), low production cost, larger mechanical strength and good homogeneity. In this study, seven-filament Cu/Ag-sheathed (Ba,K)Fe2As2 tapes were fabricated from round and square wires. It is found that the tapes rolled from square wires have a desirable uniformity of filament deformation and distribution, compared with the ones rolled from round wires. Moreover, the Jc of tape was obviously improved by using square drawing dies instead of traditional round ones. For the tapes rolled from square wires annealed under ambient and 2 MPa by hot pressing, the transport Jc values reached 1.51 × 104A·cm−2 and 4.86 × 104 A·cm−2 (4.2 K, 10 T), respectively. The deformation process on the cross section of the tapes during rolling was analyzed by using the powder-flow model. These results indicate a potential application of Cu/Ag (Ba,K)Fe2As2 tapes in high-magnetic-field region. Graphical abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)3651-3659
Number of pages9
JournalRare Metals
Issue number12
Publication statusPublished - 2021 Dec


  • Critical current density
  • Cu/Ag sheath
  • Iron-based superconductor
  • Multi-filament tape
  • Powder-flow model
  • Square drawing dies

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry


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