TY - JOUR
T1 - Improved flux pinning and high critical current density in Fe-sheathed MgB2 wires and tapes by carbon nanotube doping
AU - Xu, Aixia
AU - Ma, Yanwei
AU - Wang, Dongliang
AU - Gao, Zhaoshun
AU - Zhang, Xianping
AU - Watanabe, K.
N1 - Funding Information:
The authors thank S. Awaji, G. Nishijima, Ling Xiao, Yulei Jiao, Liye Xiao and Liangzhen Lin for their help and useful discussion. This work is partially supported by the National Science Foundation of China under Grant No. 50472063 and 50572104, National ‘973’ Program (Grant No. 2006CB601004), National ‘863’ Project (Grant No. 2006AA03Z203) and Beijing municipal science and technology commission (Grant No. Z07000300703).
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2007/11/1
Y1 - 2007/11/1
N2 - Carbon nanotube-doped Fe-sheathed MgB2 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 Jc for all the added wires and tapes. The Jc in 13 T and 4.2 K for the CNTs doped tapes (optimal MgB1.9C0.1) increased by a factor of 11 compared to that of the undoped sample. The observed Jc(B) improvement in the added samples is attributable to the enhanced flux pinning caused by the CNTs doping.
AB - Carbon nanotube-doped Fe-sheathed MgB2 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 Jc for all the added wires and tapes. The Jc in 13 T and 4.2 K for the CNTs doped tapes (optimal MgB1.9C0.1) increased by a factor of 11 compared to that of the undoped sample. The observed Jc(B) improvement in the added samples is attributable to the enhanced flux pinning caused by the CNTs doping.
KW - Critical current density
KW - Flux-pinning
KW - MgB
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U2 - 10.1016/j.physc.2007.07.005
DO - 10.1016/j.physc.2007.07.005
M3 - Article
AN - SCOPUS:34748860321
VL - 466
SP - 190
EP - 195
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 1-2
ER -