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Fabrication of the 19-filament Fe/Cu clad MgB2 wire via in situ powder-in-tube method

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  • Condensed Matter Physics
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Chinese Science Bulletin

Abstract

Using commercial amorphous B powder (92% in purity) and Mg powder (99% in purity) as starting materials, 19-filament Fe/Cu clad MgB2 wires were fabricated by an in situ powder-in-tube method. Heat treatment was performed at 700°C for 1 h under an argon gas atmosphere. The influence of Mg/B ratio on the microstructure and superconducting properties of the wires was investigated. It was found that the major phases of MgB2 wires were MgB2 accompanied with relatively small amounts of MgO and Fe2B impurities. With 5% excess Mg addition, the onset T C slightly decreased. However, the transport J C at 4.2 K and 4 T reached 1.07×104 A·cm−2, increasing by a factor of 1.4 compared to the stoichiometric sample. Moreover, the Mg1.05B2 sample showed an improved field dependence of J C, suggesting that less voids and smaller grain size of the Mg1.05B2 core lead to better grain connectivity and stronger flux pinning.

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Authors and Affiliations

  1. Applied Superconductivity Laboratory, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, 100080, China

    Yu ZhengGuang, Ma YanWei, Wang DongLiang, Gao ZhaoShun & Zhang XianPing

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  1. Yu ZhengGuang
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  2. Ma YanWei
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  3. Wang DongLiang
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  4. Gao ZhaoShun
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  5. Zhang XianPing
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Corresponding author

Correspondence to Yu ZhengGuang.

Additional information

Supported by the Beijing Municipal Science and Technology Commission (Grant No. Z07000300703), the State Key Development Program for Basic Research of China (Grant No. 2006CB601004) and the National High Technology Research and Development Program for Advanced Materials of China (Grant No. 2006AA03Z203)

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Yu, Z., Ma, Y., Wang, D. et al. Fabrication of the 19-filament Fe/Cu clad MgB2 wire via in situ powder-in-tube method. CHINESE SCI BULL 52, 2621–2625 (2007). https://doi.org/10.1007/s11434-007-0383-x

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  • DOI: https://doi.org/10.1007/s11434-007-0383-x

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