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Enhanced high-field performance in Fe-sheathed MgB2 tapes using inexpensive stearic acid additives

Published online by Cambridge University Press:  31 January 2011

Yanwei Ma ,
Zhaoshun Gao ,
Xianping Zhang ,
Dongliang Wang ,
Zhengguang Yu ,
K. Watanabe ,
Haihu Wen  and
E. Mossang
Yanwei Ma*
Affiliation:
Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100080, China
Zhaoshun Gao
Affiliation:
Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100080, China
Xianping Zhang
Affiliation:
Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100080, China
Dongliang Wang
Affiliation:
Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100080, China
Zhengguang Yu
Affiliation:
Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100080, China
K. Watanabe
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Haihu Wen
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
E. Mossang
Affiliation:
Grenoble High Magnetic Field Laboratory, C.N.R.S., 25, 38 042 Grenoble Cedex 9, France
*
a)Address all correspondence to this author. e-mail: ywma@mail.iee.ac.cn
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Abstract

High performance Fe-cladded MgB2 taps were prepared by the in situ powder-in-tube method utilizing very cheap stearic acid (C18H36O2) as dopants. The amount of stearic acid was varied from 0 to 30 wt%. We found that a significant enhancement of Jc, Hirr, and Hc2 in comparison with undoped samples was easily achieved. At 4.2 K, the transport Jc for the best doped tapes (10 wt%) reached 2 × 104 A/cm2 at 10 T and 3.7 × 103 A/cm2 at 14 T, respectively, an order of magnitude higher than for the pure tapes. In particular, at 20 K, the irreversibility field of the 10 wt% doped tape was around 10 T, which is comparable to the upper critical field of the commercial NbTi at 4.2 K. The results demonstrate great potential of MgB2 tapes for superconducting magnets.

Keywords

DopantElectrical propertiesSuperconducting
Type
Rapid Communications
Information
Journal of Materials Research , Volume 22 , Issue 11 , November 2007 , pp. 2987 - 2991
Copyright
Copyright © Materials Research Society 2007

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References

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