Fabrication and transport critical current densities of MgB 2/Fe/Cu multifilament tapes without any intermediate annealing

Yucel E., Terzioglu C., Varilci A., GENÇER A., Belenli I.

Acta Physica Polonica A, cilt.121, sa.3, ss.660-665, 2012 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 121 Sayı: 3
  • Basım Tarihi: 2012
  • Doi Numarası: 10.12693/aphyspola.121.660
  • Dergi Adı: Acta Physica Polonica A
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.660-665
  • Ankara Üniversitesi Adresli: Evet

Özet

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.