Synthesis of Bi2223 by Low [Formula Omitted] Sintering

Silver-sheathed Bi(Pb)2223 tapes have been developed as the first-generation high- [Formula Omitted] superconducting material. Generally, a long-time sintering condition exceeding 100 h at [Formula Omitted] in [Formula Omitted] has been fixed for more than 20 years to prepare Bi(Pb)2223. In addition, there are few studies on the optimization of [Formula Omitted] during sintering. In the present study, a low [Formula Omitted] synthesis was applied for fabrication of the Bi(Pb)2223 bulks and tapes. The silver-sheathed Bi(Pb)2223 tapes were prepared by sintering under various conditions including hot isostatic pressing treatment. Fine Bi(Pb)2223 grains were observed in the samples when the first sintering was performed in [Formula Omitted]. This led to densification of oxide core by second sintering using hot isostatic pressing treatment [Formula Omitted], resulting in improvements of sharpness of superconducting transition and [Formula Omitted] at 77 K.