EFFECT OF PROCESSING PARAMETERS ON SUPERCONDUCTING PROPERTIES OF AG-SHEATHED BI-2223 TAPE

Silver-sheathed tapes were fabricated using a Bi-2223 system. The tape s were processed to their final thickness by direct rolling as well as by repeated rolling with intermediate heat treatment. The rolling red uction rate was also varied to find its effect on the final properties . The critical current J(c) measured at 77 K could be enhanced to 12 5 00 A cm-2 for repeatedly rolled tapes from 2770 A cm-2, obtained in di rectly rolled tapes processed under identical conditions. In repeatedl y rolled tapes the J(c)-B variations were found to be much lower in co mparison to the directly rolled tapes. Texture evaluation using the an gular dependence of the magnetoresistance showed the a-b plane orienta tion to be along the rolling direction.