Influence of filament thickness, thermal process and magnetic field on misalignment angles in multifilament Bi2212 tapes

摘要

Misalignment angles in multifilament Bi2212 tapes have been studied by transport current density (J_c) measurements. Transversal misalignment angles depend on the filaments thickness due to the crystal growth along the Bi2212/silver interface. Therefore, the thinner the filaments, the higher the J_c. A dynamic thermal treatment improves grain alignment inside the tapes due to preferential crystal growth along the thermal gradient direction. Furthermore, melting in high magnetic field reduces the misalignment angle due to magnetic anisotropy effects. Therefore, good transport J_c performances can be expected for thicker multifilament B12212 tapes prepared using a combination of the dynamic process and melting in a high magnetic field.