TEXTURATION OF BI-BASED-2212 SUPERCONDUCTING BULK CERAMICS

The magnetic texturing growth (Mag TG) technique has been applied for the first time to 2212 powder (Bi2Sr2Ca0.8Dy0.2Cu2Oy) in order to obta in well-textured, Bi-based bulk ceramics. The sample has been analyzed by X-ray diffraction analysis, polarized light microscopy, scanning e lectron microscopy, and EDX analysis. Electric resistivity measurement s have also been made. A well-textured sample with an intergrowth of t wo phases was observed: the expected 2212 superconducting phase sandwi ching a non-superconducting Bi-rich phase. The electric transition is quite sharp with a T-c around 87 K. Some further experiments in gold a nd copper tubes have been performed and offer the possibility of provi ding well-textured coils.