Enhanced Jc in Bi-2212 Round Wires With Optimization of Calcination Atmosphere

High-performance precursor powders are crucial for the transport current of Bi 2 Sr 2 CaCu 2 O x (Bi-2212) round wires. However, the impact of the powder calcination process on the wire performance is not fully understood. Here, Bi-2212 precursor powders were prepared using ultrasonic spray pyrolysi...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2024-05, Vol.34 (3), p.1-4
Main Authors: Jin, L. H., Xiong, Z. K., Xu, X. Y., Liu, G. Q., Feng, J. Q., Zhang, S. N., Hao, Q. B., Li, C. S., Zhang, P. X.
Format: Article
Language:English
Subjects:
Atmosphere
Bars
Bi-2212 wire
Bismuth strontium calcium copper oxide
Bridges
Calcination
calcination atmosphere
Critical current density
Filaments
high temperature superconductor
Microstructure
Oxygen
Partial pressure
Powders
precursor powder
Precursors
Roasting
Spray pyrolysis
Wires
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Summary:High-performance precursor powders are crucial for the transport current of Bi 2 Sr 2 CaCu 2 O x (Bi-2212) round wires. However, the impact of the powder calcination process on the wire performance is not fully understood. Here, Bi-2212 precursor powders were prepared using ultrasonic spray pyrolysis technique and then calcined under different atmospheres. The influences of calcination atmosphere on the microstructures, melting behavior and critical current density ( J c ) of Bi-2212 multi-filamentary wires were systematically discussed by tuning the oxygen partial pressure from 0.001 bar to 1.0 bar. As the oxygen partial pressure was increased, a more uniform melting behavior was observed in the Bi-2212 wires, and the large merging bridges was reduced in the filaments. High J c of 2715 A/mm 2 at 4.2 K, 12 T were achieved in the sample with 1.0 bar O 2 . Therefore, controlling calcination atmosphere of precursor powder was significant for achieving superior transport current of Bi-2212 wires.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2023.3335878