The local phase conversion and critical current density of silver-doped (Bi/Pb)2Se2Ca2Cu3Ox tapes

Yi, Z., Law, L., Beduz, C., Scurlock, R.G. and Riddle, R. (1997) The local phase conversion and critical current density of silver-doped (Bi/Pb)2Se2Ca2Cu3Ox tapes. Cryogenics, 37 (10), 605-608. (doi:10.1016/S0011-2275(97)00065-9).

Abstract

The effect of silver doping on the local phase conversion and critical current density of silver-sheathed (Bi/Pb)2223 tapes has been studied. Four tapes were prepared using precursor powers produced by the Evaporative Decomposition of Solution (EDS) method. The control tape had a nominal stoichiometry of bi1.84Pb0.34Sr1.91Ca2.03Cu3.06Ox, whilst the second and third tapes had 8 wt% and 15 wt% silver, respectively, added during the EDS process. Using this method the silver can be homogeneously mixed with the oxide material on an atomic scale. For the fourth tape, 8 wt% silver particles were mixed by hand with the EDS processed powder. We have found that the silver additions tend to enhance and homogenize the local phase conversion throughout the core of the tapes, although no significant difference has been observed in the critical current densities for the different samples. The maximum Jc (77 K, self-field) obtained in these tapes is about 1.8 × 104 A cm?2.

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