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- Title
Phase evolution and critical current density during post-annealing in Bi-2223/AgAu tapes.
- Authors
Ma, Xiaobo; Zhang, Shengnan; Jin, Lihua; Shao, Baitao; Liu, Xueqian; Liu, Guoqing; Li, Jianfeng
- Abstract
37-filamentary Bi2Sr2Ca2Cu3O10+δ (Bi-2223) superconducting tapes were prepared by powder-in-tube (PIT) technique. During the second heat treatment process (HT2), tapes were sintered at 826 °C for different time and then cooled to 780 °C with different rate. The changes of sintering time and cooling rate obviously influenced liquid phase content after HT2. Therefore, (Pb, Bi)3Sr2Ca2CuOx (3221) phase content changed accordingly after post-annealing (PA). After PA, Jc of 50Q-PA (sintered at 826 °C for 50 h, quenched in air, then post-annealed at 780 °C for 36 h), 50SC-PA (sintered at 826 °C for 50 h, then cooled to 780 °C with cooling rate of 1 °C/h, post-annealed at 780 °C for 36 h) and 78SC-PA (sintered at 826 °C for 78 h, then cooled to 780 °C with cooling rate of 1 °C/h, post-annealed at 780 °C for 36 h) samples increased to 12.9 kA/cm2, 17.9 kA/cm2, and 18.5 kA/cm2, which were 1.81, 1.12, and 1.04 times of Ic of HT2 samples, respectively. Meanwhile, the change of intergrain connections and the flux pinning properties were investigated based on the in-field critical current, Jc-B measurement.
- Publication
Journal of Materials Science: Materials in Electronics, 2024, Vol 35, Issue 18, p1
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-024-12960-3