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Investigation of Nb–B Diffusion and the Superconducting Properties of MgB2/Nb/Cu Tapes

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Abstract

The Nb–B diffusion behaviors and their effects on the superconducting properties of MgB2/Nb/Cu tapes were investigated. Two relevant samples of the Nb–B diffusion couples and monocore MgB2/Nb/Cu tapes were prepared with the same standard in situ PIT method, respectively. And both the samples were sintered at 650, 750, 850, and 950°C for 2 hours, respectively. It has been found that Nb–B interface is invisible in the diffusion couples sintered at low temperatures as 650°C, correspondingly the superconducting properties of MgB2 tapes are superior to those of the ones sintered at the other three temperatures. With the heating temperature increasing, Nb–B interface, mainly NbB2 with a little NbB, appears and becomes thicker gradually in the Nb–B diffusion couples. The corresponding superconducting properties of MgB2 tapes follow the similar patterns: within the range from 650°C to 950°C, the higher the sintering temperature, the poorer the superconducting performances, because the Nb–B diffusion in MgB2 tapes could cause the property degradations of MgB2/Nb tape. As extended to the actual fabrications of Nb sheathed MgB2 tapes or wires, suitable sintering temperature range should be from 650°C to 750°C for the desired performances.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation (No. 50877067) and the National Key Basic Research Program (No. 2011CBA00104) of China.

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Authors and Affiliations

  1. Northeastern University, Shenyang, 110004, P.R. China

    YuYan Sun, PingXiang Zhang & Ming Qi

  2. Northwest Institute for Nonferrous Metal Research, Xi’an, 710016, P.R. China

    PingXiang Zhang, QingYang Wang, Fang Yang, GaoFeng Jiao & GuoQing Liu

  3. Institute NEEL/CNRS-UJF, B.P. 166, Grenoble, 38042, France

    André Sulpice

  4. Western Superconducting Technologies Co., Ltd., Xi’an, 710018, P.R. China

    Guo Yan

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  1. YuYan Sun
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Correspondence to YuYan Sun.

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Sun, Y., Zhang, P., Wang, Q. et al. Investigation of Nb–B Diffusion and the Superconducting Properties of MgB2/Nb/Cu Tapes. J Supercond Nov Magn 25, 943–950 (2012). https://doi.org/10.1007/s10948-011-1395-y

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  • DOI: https://doi.org/10.1007/s10948-011-1395-y

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