Title :
Low-field behavior of Ti-added MgB2/Cu superconducting wires
Author :
Gencer, A. ; Kiliç, A. ; Okur, S. ; Güçlü, N. ; Özyüzer, L. ; Belenli, I.
Author_Institution :
Phys. Dept., Ankara Univ., Turkey
fDate :
6/1/2005 12:00:00 AM
Abstract :
We report on low-field magnetic properties of Ti-added (0-20 wt. % of Ti) Cu-clad MgB2 superconducting wires. Wires were produced by mixing appropriate amount of Ti and reacted MgB2 powder which was then placed inside Cu tubes with a diameter of 6 mm. The tubes were then cold worked by rolling or drawing to smaller diameters and then annealed at various temperatures to enhance the grain connectivity. XRD studies show that Ti addition results in new but minor phases. We have then measured ac susceptibilities in the temperature range between 20 K and 40 K in ac fields of 20-1600 A/m. The data show that an additional loss mechanism is established with Ti-addition. The calculated ac losses are increasing with increasing Ti-content in the main superconducting matrix.
Keywords :
cold rolling; critical current density (superconductivity); granular superconductors; magnesium compounds; magnetic susceptibility; powders; rapid thermal annealing; superconducting tapes; superconducting transitions; titanium compounds; type II superconductors; 20 to 40 K; 6 mm; Cu tubes; MgB2 powder; MgB2/Cu superconducting wires; MgB2:Ti-Cu; Ti addition; XRD study; ac losses; ac susceptibility; cold rolling; critical current density; grain connectivity; granularity; loss mechanism; low-field magnetic property; superconducting matrix; Annealing; Art; Copper; Critical current density; Physics; Powders; Superconducting filaments and wires; Superconducting materials; Superconductivity; Temperature; AC susceptibility; critical current density; granularity;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2005.848897
