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SEM, XRD-data, and critical properties are presented which concern to Bi-2223 composite tapes processed under various conditions. The multifilamentary tapes were made by the PIT procedure with using of extrusion and/or drawing and tape rolling. Initial properties of powder precursors, filling factor, tape rolling, and heat treatment conditions as well as O2-content in working atmosphere were varied. The achieved critical properties are described and analyzed. In particular, on basis of XRD-data significant differences in Bi-2223 grains substructure for tapes having different levels of critical current have been revealed.
Date of Publication: June 2005