Fabrication and Transport Critical Current Densities of MgB2/Fe/Cu Multifilament Tapes without Any Intermediate Annealing |
| E. Yucela, C. Terzioglub, A. Varilcib, A. Gencerc and I. Belenlib
aDepartment of Physics, Faculty of Arts and Sciences, Mustafa Kemal University, 31034 Hatay, Turkey bDepartment of Physics, Faculty of Arts and Sciences, Abant Izzet Baysal University, 14280 Bolu, Turkey cDepartment of Physics, Faculty of Science, Ankara University, 06100 Ankara, Turkey |
| Received: May 31, 2011; In final form: December 8, 2011 |
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| We have fabricated superconducting 6 and 7 filaments MgB2/-Fe/Cu tapes by ex situ powder-in-tube method using Cu-sheath without any intermediate annealing. Properties of two different multicore MgB2/-Fe/Cu tapes annealed at 900°C for 2 h in high purity argon gas atmosphere were compared. The samples were characterized using scanning electron microscope, X-ray diffraction, electron dispersive spectroscopy, optical microscopy, critical transition temperature, transport critical current density, and magnetic measurements. Transport critical current densities of the 6 and 7 filaments tapes were found to be 450 A/cm2 and 190 A/cm2 at 20 K, respectively. From X-ray diffraction measurements, lattice parameters a and c were determined. From dc resistivity measurements, the connectivity between grains was investigated by using Rowell's connectivity analysis. |
| DOI: 10.12693/APhysPolA.121.660 PACS numbers: 74.70.Ad, 84.71.Mn, 74.62.-c, 74.25.Sv, 74.25.F- |