Development of Powder-in-Tube Processed Iron Pnictide Wires and Tapes

Abstract

The development of the PIT fabrication process of iron pnictide superconducting wires and tapes has been carried out in order to enhance their transport properties. Silver was found to be the best sheath material, since no reaction layer was observed between the silver sheath and the superconducting core. The grain connectivity of iron pnictide wires and tapes has been markedly improved by employing Ag or Pb as dopants. At present, critical current densities in excess of 3750 A/cm^2 (Ic = 37.5 A) at 4.2 K have been achieved on Ag-sheathed SrKFeAs wires prepared with the above techniques, which is the highest in iron-based wires and tapes so far. Moreover, Ag-sheathed Sm-1111 superconducting tapes were successfully prepared by PIT method at temperatures as low as 900C, instead of commonly used temperatures of 1200C. These results demonstrate the feasibility of producing superconducting pnictide composite wires, even grain boundary properties require much more attention.

4 pages, 6 figures. Submitted to ASC2010 proceedings

References in corpus (3)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Fabrication of the iron-based superconducting wire using Fe(Se, Te)
• Superconducting properties of SmO1-xFxFeAs wires with Tc = 52 K prepared by the powder-in-tube method

Cited by in corpus (14)

• Recent advances in iron-based superconductors toward applications
• Exploration of new superconductors and functional materials and fabrication of superconducting tapes and wires of iron pnictides
• Progress in wire fabrication of iron-based superconductors
• The behavior of grain boundaries in the Fe-based superconductors
• High transport critical current densities in textured Fe-sheathed Sr1-xKxFe2As2+Sn superconducting tapes
• Oxypnictide SmFeAs(O,F) superconductor: a candidate for high-field magnet applications
• Fabrication and transport properties of Sr0.6K0.4Fe2As2 multifilamentary superconducting wires
• Transport properties of the single- and 3-core Fe-Se wires fabricated by a novel chemical-transformation PIT process
• Improved transport critical currents in Ag and Pb co-doped BaxK1-xFe2As2 superconducting tapes
• Large enhancement of transport critical current density of ex-situ PIT Ag/(Ba,K)Fe2As2 tapes achieved by applying cycles of cold deformation and heat treatment
• Effect of starting materials on the superconducting properties of SmFeAsO1-xFx tapes
• Improvement in granularity of NdFeAsO0.8F0.2 superconductor through Ag doping
• Evolution of tetragonal phase in the FeSe wire fabricated by a novel chemical-transformation PIT process
• Calculation of the transport critical current density of c-axis textured 122 iron-based superconductors