Title :
Improving the critical current density in Bi-2223 wires via a reduction of the secondary phase content
Author :
Huang, Y.B. ; Cai, X.Y. ; Holesinger, T. ; Maroni, V.A. ; Yu, D. ; Parrella, R. ; Rupich, M. ; Hellstrom, E. ; Teplitsky, M. ; Venkataraman, K. ; Otto, A. ; Larbalestier, D.
Author_Institution :
American Supercond., Westborough, MA, USA
fDate :
6/1/2003 12:00:00 AM
Abstract :
Progress in the performance of multifilamentary composite Bi-2223 wire fabricated at American Superconductor is reviewed. Critical current (Ic) performance of 175 A at 77 K and self-field and critical current density (Jc) performance of 22.1 kA/cm2 (77 K, 0.1 T perpendicular to the tape plane) have been measured for short samples of Bi-2223 wire (standard size is 0.21×4.0×100 mm). Microstructure analysis by SQUID magnetometry, transmission XRD and TEM shows a large amount of residual 2212 intergrowth remaining in Bi-2223 grains. Residual 2212 intergrowth is seen to correlate with self-field Jc at 77 K across a range of experimental samples, suggesting that higher levels of performance will be achieved by further reducing residual 2212.
Keywords :
X-ray diffraction; bismuth compounds; calcium compounds; critical current density (superconductivity); crystal microstructure; high-temperature superconductors; phase diagrams; strontium compounds; superconducting tapes; transmission electron microscopy; 0.21 mm; 100 mm; 175 A; 4.0 mm; 77 K; Bi-2223 wires; Bi2Sr2Ca2Cu3O10:Bi2Sr2CaCu2O8; SQUID magnetometry; TEM; critical current density; high temperature superconductor; microstructure analysis; multifilamentary composite wire; residual 2212 intergrowth; secondary phase content; self-field; transmission XRD; Critical current; Critical current density; Current measurement; Density measurement; Measurement standards; Microstructure; Multifilamentary superconductors; Size measurement; Superconducting filaments and wires; Superconducting films;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.812067
