Title :
Significantly enhanced critical current density in Bi-2223/Ag multifilamentary tapes by hot pressing
Author :
Zeng, R. ; Ye, B. ; Horvat, J. ; Guo, Y.C. ; Zeimetz, B. ; Yang, X.F. ; Beales, T.P. ; Liu, H.K. ; Dou, S.X.
Author_Institution :
Inst. for Supercond. & Electron. Mater., Wollongong Univ., NSW, Australia
fDate :
6/1/1999 12:00:00 AM
Abstract :
Bi-2223/Ag multifilamentary tapes were fabricated using a hot-pressing technique to investigate its effect on grain connectivity and flux pinning. The critical current density in tapes after hot-pressing was doubled. J/sub c/ increased from 26000A/cm/sup 2/ to 56100A/cm/sup 2/ in a 19-filament tape. However, the critical current density in an applied magnetic field was not improved by hot-pressing. The fraction of strong links (I/sub C0//sup s//I/sub C0/) was improved from 47% to 68% in a 19-filament tape due to hot pressing. Microstructural analysis showed that hot-pressing improved grain connectivity, increased core density and reduced secondary phases.
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); flux pinning; high-temperature superconductors; hot pressing; multifilamentary superconductors; silver; strontium compounds; superconducting tapes; 19-filament tape; Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O-Ag; applied magnetic field; core density; critical current density; flux pinning; grain connectivity; hot pressing; multifilamentary tapes; secondary phases; strong links; Critical current density; Flux pinning; Magnetic analysis; Magnetic field measurement; Multifilamentary superconductors; Optical microscopy; Pressing; Scanning electron microscopy; Superconducting materials; Transmission electron microscopy;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
