Abstract
Bi1.8Pb0.4Sr2Ca2.2Cu3—xFexOy silver-sheathed (Bi2223/Ag) tapes with different Fe-doping amounts, x = 0.001, 0.002, 0.003, 0.004, were fabricated by powder-in-tube (PIT) technique. It is found that the magnetic field dependence of critical current density Jc(H) is improved for samples with Fe-doping amounts of x = 0.001, 0.002, and 0.003 at high magnetic fields, while the Jc(H) behavior deteriorates with Fe-doping level increasing further. X-ray diffraction analyses manifest that a small amount of Fe-doping has little effect on the phase composition of Bi2223/Ag tapes. Scanning electron microscopy (SEM) observations do not show an obvious difference between un-doped and Fe-doped samples. It is concluded that the enhanced flux pinning originates from the introduction of effective pinning centers due to Fe ions partial substitution for Cu ions.
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