Fabrication and transport critical current densities of MgB 2/Fe/Cu multifilament tapes without any intermediate annealing
Acta Physica Polonica A, cilt.121, sa.3, ss.660-665, 2012 (SCI-Expanded, Scopus)
- 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.