Abstract
Investigations into flux-pinning of Bi 2Sr 2CaCu 2O 8+ δ /Ag (Bi-2212/Ag) thick film conductors utilizing micron-sized (Sr,Ca) 14Cu 24O 41 and nanophase Al 2O 3 and Au particles are described. Addition of defect particles delayed and reduced formation of 2212 c-axis texture, while improving film quality by inhibiting Sr:Ca:Cu:O defect formation. Oxide defects were observed to rapidly coarsen in the melt, simultaneously with beneficial increase of 2212 texture. Nanophase Al 2O 3 reacted rapidly (<4 min) with 2212-type melts (Sr:Ca=1.33–2.07) to form solid–solution (Sr,Ca) 3Al 2O 6 with Sr:Ca ratio close to the Sr:Ca composition of the precursor matrix. Addition of nanophase Al 2O 3 improved the J c (1 T) over the range 20–30 K, e.g. J c (30 K, 1 T)/ J c (5 K, 0 T)=(<0.001), 0.005, and 0.065 for 0%, 10% and 46% molar addition, respectively. The addition of nanophase or micron-sized Au completely suppressed 2212 c-axis orientation for the processing temperatures tested.
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