FABRICATION AND CHARACTERIZATION OF LONG MONO-FILAMENTARY AND MULTI-FILAMENTARY TL-1223 AG SUPERCONDUCTING TAPES/

Long mono- and multi-filamentary Tl-1223/Ag tapes with a Tl0.93Bi0.22S r1.6Ba0.4Ca2Cu3O9+delta nominal composition were prepared using the po wder-in-tube method combined with a two-step reaction method. J(c)'s o f 9,200, 3,300, and 2,000 A/cm(2) at 77 K and 0 T were obtained in 2.6 -m-long monocore, 5-m-long 19-filamentary, and 1.2-m-long 361-filament ary tapes, respectively. The relatively low J(c)'s in the multi-filame ntary tapes are attributed to severe destruction of filament continuit y, resulting from the two-step reaction method, during mechanical work ing. The dependence of the transport J(c)'s on the bending strain was almost similar to that in Bi-2223 tapes. A relatively high J(c) of 12, 000 A/cm(2), which was obtained in a long tape prepared using Tl0.8Pb0 .2Bi0.2Sr1.6Ba0.4Ca2Cu3O9+delta, enhanced the applicability of Tl-1223 /Ag tapes to practical systems.