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Effect of Pre-Treatment on the Microstructure and Superconducting Properties of Bi-2223/Ag Tapes

The effect of pre-treatment on the microstructure and critical current of (Bi,Pb)-2223/Ag tapes has been investigated. Experimental results show that pre-treatment has important influences on the formation and the grain size of the (Bi,Pb)-2223 phase as well as the performances of Bi-2223/Ag tapes. During the pre-treatment process, the decomposition of the 3321 phase enhances the growth of (Bi,Pb)-2212 grains, which promotes the formation of (Bi,Pb)-2223 phase because it followed the size and orientation of the original (Bi,Pb)-2212 phase. As a result, the properties of Bi-2223/Ag tapes were remarkably improved.