Improved Jc Behavior under Magnetic Field in Bi1.8Pb0.4Sr2Ca2.2Cu3—xCrxOy/Ag Tapes

Bi(2223)/Ag tapes with CrO3 doping have been fabricated by Powder-in-Tube (PIT) method. It is found that a small amount of CrO3 doping improves the flux pinning, with the effective pinning center due to Cr substitution for Cu, while excessive Cr-ion doping degrades the superconductivity of Bi(2223). XRD analysis shows that a small amount of CrO3 addition has no effect on the phase composition of Bi(2223)/Ag tape. SEM micrographs of Bi(2223) tapes do not show a distinct difference between the pure sample and CrO3 doped samples (x ≤ 0.4%).