High J(c)'s observed in just-rolled Tl-1223/Ag tapes prepared using a Tl0.8Pb0.2Bi0.2Sr1.6Ba0.4Ca2Cu3Oz composition

摘要

Tl-1223/Ag tapes with a nominal composition of Tl0.8Pb0.2Bi0.2Sr1.6Ba0.4Ca2Cu3Oz were prepared using the powder in-tube method combined with an in-situ reaction method, and their characteristics were mainly compared to those of Tl0.93Bi0.22Sr1.6Ba0.4Ca2Cu3Oz tapes. As a result, the morphology in the present tapes seemed to be almost similar to those in Tl0.93Bi0.22Sr1.6Ba0.4Ca2Cu3Oz tapes, except that it became denser. However, the temperature range for the stabilization of Tl-1223 phase widened a little, and J(c)'s at 77 K and 0 T increased, The enhanced J(c)'s in the tapes were attributed to enhanced effective area for current flow due to enhanced densification. probably resulting from doping of both Pb and Bi. In the present study, a high transport J(c) of 18,100 A/cm(2) at 77 K and 0 T was obtained, (C) 1998 Elsevier Science B.V. [References: 21]