Abstract
Heavily Pb-doped Bi-2212/Ag tapes have been prepared using an isothermal partial melting (IPM) method. Under heavy Pb doping, irreversibility field ( H irr) for magnetic fields parallel to the c-axis ( H‖ c-axis) is elevated at temperatures higher than 20 K and is comparable to H irr for H‖ ab-plane. As a result, the original anisotropic pinning properties disappear in Pb-doped tape. At 30 K, the isotropic pinning force suppresses the anisotropy of transport critical current density ( J c) under magnetic field which is the most serious problem for power applications of Bi-2212 materials. Transmission electron microscopic (TEM) observation shows a disordered stripe structure and stacking faults along the c-axis in the bc-plane of Bi-2212 grains in Pb-doped tape. Such a stripe structure or stacking faults seem to be related to the production of strong pinning centers by heavy Pb doping.
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