Texture development of a multi-filamentary Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ tape during thermo-mechanical treatment

In order to investigate texture development of superconducting grains, multi-filamentary Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ (Bi-2223)/Ag tapes were fabricated with different pass reduction ratios of rolling. The deformation-induced-texture and reaction-induced-texture for Bi-2212 and Bi-2223 were evaluated by X-ray diffraction including pole figure analysis. It was found that the texture of Bi-2223 develops by the progress of thermo-mechanical treatment. The texture for both Bi-2212 and Bi-2223 was found to develop better along the rolling direction than the transverse direction. By scanning electron microscopy observation, the highly textured region of Bi-2223 grain was found to expand by the intermediate rolling and additional heat treatment.