COMPARATIVE STUDY ON TL1212/AG DIP-COATED TAPES FABRICATED USING SOLID-STATE AND CORPECIPITATION DERIVED POWDERS.

Abstract

Ag-clad dip-coated superconductors tapes were fabricated from TL-1212 superconducting powders of Tl0.8 Bi0.2 Sr2 Ca0.8 Y0.2 Cu2 07 starting composition derived via two different methods; the conventional solid-states (SS) and co precipitation (CP) methods. The effects of using superconducting powders derived from SS to CP methods on phase formation micro structure and critical current density were investigated for tapes annealed at 850C for minutes in flowing 02. XRD analysis of tapes oxide cores indicated a higher volume percentage of 1212 phase for the SS tape compared to the CP tape . However, The oxide Jc of the CP tape(4670 A/cm2) was higher than the SS tape (557A/cm2). The SEM micro graph of the CP tape’s oxide core revealed melted-like fused grains, a factor that was associated with high Jc value of the tape , in contrast to the SS tape’s core that displayed cracks and porous micro structure.