Ex Situ MgB{sub 2} Superconducting Tape with Very High Critical Current Density by Using Low-Temperature Sintering Precursor Powders

Journal Article · Wed May 15 04:00:00 EDT 2019 · Journal of Superconductivity and Novel Magnetism

DOI:https://doi.org/10.1007/S10948-018-4861-Y· OSTI ID:22921265

Sun, X. G.; Yang, X. S. ^[1]; Xi, D. ^[2]; Wang, Q. Y. ^[3]; Yan, G.; Feng, Y. ^[2]

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1. Southwest Jiaotong University, Key Laboratory of Advanced Technology of Materials (Ministry of Education), Superconductivity and New Energy R&D Center (China)
2. Western Superconducting Technologies, Co. Ltd (WST) (China)
3. Northwest Institute for Non-ferrous Metal Research (NIN) (China)

Ex situ MgB{sub 2} is usually considered as with lower critical current density (J{sub c}) compared to the in situ one due to much worse inter-granular connectivity. In this work, we reported the fabrication of ex situ MgB{sub 2} superconducting tape without dopants using Monel as sheath materials and Nb as the barrier, which has an excellent J{sub c} of 705 A/mm{sup 2} at 4.2 K under 4 T, almost as same as the in situ MgB{sub 2} wires. Massive and high-quality precursor powders with small grain sizes and quite low oxygen content were sintered at relatively low temperature and short time, 580 {sup ∘}C for 3 h. The effects of heat-treatment conditions and tape thickness on the microstructure and J{sub c} of ex situ MgB{sub 2} tapes were discussed. The results suggested that the improvement of grains-connectivity was responsible to the excellent J{sub c} properties of ex situ MgB{sub 2} tape.

• OSTI ID: 22921265
• Journal Information: Journal of Superconductivity and Novel Magnetism, Journal Name: Journal of Superconductivity and Novel Magnetism Journal Issue: 5 Vol. 32; ISSN 1557-1939
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COMPARATIVE EVALUATIONS
CRITICAL CURRENT
DOPED MATERIALS
GRAIN SIZE
HEAT TREATMENTS
MAGNESIUM BORIDES
OXYGEN
SUPERCONDUCTORS
TEMPERATURE RANGE 0000-0013 K