HIGH J(C)S OBSERVED IN JUST-ROLLED TL-1223 AG TAPES PREPARED USING A TL0.8PB0.2BI0.2SR1.6BA0.4CA2CU3OZ COMPOSITION/

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 com pared to those of Tl0.93Bi0.22Sr1.6Ba0.4Ca2Cu3Oz tapes. As a result, t he morphology in the present tapes seemed to be almost similar to thos e in Tl0.93Bi0.22Sr1.6Ba0.4Ca2Cu3Oz tapes, except that it became dense r. However, the temperature range for the stabilization of Tl-1223 pha se widened a little, and J(c)'s at 77 K and 0 T increased, The enhance d J(c)'s in the tapes were attributed to enhanced effective area for c urrent flow due to enhanced densification. probably resulting from dop ing 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.