Title :
Microstructural variations with uranium compound doping of Bi-Sr-Ca-Cu-O/Ag superconducting tapes
Author :
Milliken, Damion A. ; Ahn, Jung H. ; Dou, Shi X.
Author_Institution :
Inst. for Supercond. & Electron. Mater., Wollongong Univ., NSW, Australia
fDate :
3/1/2001 12:00:00 AM
Abstract :
Doping of Bi-Sr-Ca-Cu-O based silver sheathed superconducting tapes (BSCCO/Ag) with various uranium compounds was carried out. This work was aimed at minimising the detrimental effects of doping to allow for later irradiation and fission to create columnar defects for strong flux pinning. The effects on the transport current density of BSCCO/Ag of doping with a variety of uranium compounds up to 2 at% was determined. Microstructural changes due to the doping were investigated. Removal of elements from the BSCCO matrix by uranium compound dopants was studied by energy dispersive spectroscopy. It was found that UCa1.5Sr1.5O6 least degraded electrical performance and microstructure, as it removed the least elements from the matrix. It would appear that UCa1.5Sr1.5O6 most closely approximates an ideal BSCCO compatible uranium compound, but it still removes some amount of copper
Keywords :
X-ray chemical analysis; bismuth compounds; calcium compounds; critical current density (superconductivity); flux pinning; high-temperature superconductors; strontium compounds; superconducting tapes; uranium compounds; Ag sheathed superconducting tapes; BiSrCaCuO:UCaSrO-Ag; U compound doping; columnar defects; energy dispersive spectroscopy; flux pinning; transport current density; Bismuth compounds; Current density; Degradation; Dispersion; Doping; Flux pinning; Silver; Spectroscopy; Strontium; Superconducting films;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
