Grain Morphology for Bi2Sr2CaCu2O8 Tapes Heat-Treated in High Magnetic Fields

K. Watanabe; T. Inoue; S. Awaji

doi:10.4028/www.scientific.net/AST.75.187

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HomeAdvances in Science and TechnologyAdvances in Science and Technology Vol. 75Grain Morphology for Bi2Sr2CaCu2O8 Tapes...

Grain Morphology for Bi₂Sr₂CaCu₂O₈ Tapes Heat-Treated in High Magnetic Fields

Abstract:

We prepared Ag-sheathed Bi2Sr2CaCu2O8 (Bi2212) tapes heat-treated in high fields (in-field heat-treatment Bi2212) and heat-treated without magnetic fields (out-of-field heat-treatment Bi2212), in order to examine the magnetic field effect on the microstructure of Bi2212. The differential thermal analysis (DTA) was performed at 10 T using Bi2212 powders. The DTA suggests that the in-field heat-treatment changes the grain morphology of Bi2212. It was found that the critical current density Jc for the in-field heat-treatment Bi2212 tape is largely improved at 10 K in fields. In addition, the in-field heat-treatment Bi2212 tape has also a large n-value in the form of E=Ec(J/Jc)n, which is related to the microstructure change.