Improved flux pinning and high critical current density in Fe-sheathed MgB2 wires and tapes by carbon nanotube doping
✍ Scribed by Aixia Xu; Yanwei Ma; Dongliang Wang; Zhaoshun Gao; Xianping Zhang; K. Watanabe
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 594 KB
- Volume
- 466
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
Carbon nanotube-doped Fe-sheathed MgB 2 wires and tapes with different doping levels were fabricated by the in situ powder-in-tube method. The phases, microstructures and flux pinning were characterized by XRD, SEM/TEM, magnetic and transport-property measurements. It is found that carbon nanotubes (CNTs) doping resulted in a significant enhancement in the field dependence of critical current density J c for all the added wires and tapes. The J c in 13 T and 4.2 K for the CNTs doped tapes (optimal MgB 1.9 C 0.1 ) increased by a factor of 11 compared to that of the undoped sample. The observed J c (B) improvement in the added samples is attributable to the enhanced flux pinning caused by the CNTs doping.