Abstract
For the purpose of introducing extra flux pinning centers, nanometer Ca 2PbO 4 precipitates were produced in (Bi,Pb) 2Sr 2Ca 2Cu 3O x silver-sheathed tapes by means of post-annealing the fabricated tapes in flowing oxygen. The normalized critical current density of the post-annealed samples is much higher than that of non-annealed samples under a magnetic field up to 1T. XRD and SEM analysis show that nanometer Ca 2PbO 4 precipitates appear during annealing. These fine Ca 2PbO 4 precipitates may be responsible for the enhanced flux pinning for (Bi,Pb)-2223/Ag tapes.
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