Abstract
The relationships between a critical current density (JC) and microstructure of Bi-2212/Ag composite tapes prepared by the melt-solidification under a temperature gradient have been investigated. We used a tube furnace with a temperature gradient for the heat treatment. The critical current density (JC) of the order of 4×109 A/m2 at 4.2 K under 10 T were obtained for the tape fabricated under a temperature gradient. We optimized the tape width, temperature gradient and cooling rate in melt-solidification process. The optimum tape width, temperature gradient and cooling rate were 2-4 mm, 200 K/m, and 2 K/h, respectively. JC enhancement of these tapes fabricated by melt-solidification under temperature gradient was attributed the improvement of the c-axis grain alignment, the in-plane texturing near the oxide/silver interface, and large grain size.
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