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The Effects of Excess Mg Addition on the Superconductivity of MgB2

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Abstract

The effects of 0∽30 mol % excess Mg addition on the superconducting properties of MgB2 bulks were investigated. We found that the excess Mg addition improved the critical current (J c) at low temperatures and low magnetic fields. The critical temperatures (T c) of the excess Mg samples reduced slightly. The excess Mg reduces the MgO content in the system, improves the connectivity, and thus enhances the critical current density at low magnetic fields and low temperature. The highest J c was obtained in the 5-mol% excess Mg sample which has the best grain connectivity.

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Acknowledgments

In this paper, the authors wish to thank the fund for the project support, including the Fundamental Research Funds for the Central Universities (A0920502051411-5), the National Natural Science Foundation of China (51377138 and 51271155), and the National Science and Technology Projects Foundation (2013DFA51050, 2013GB114003-1, 2014AA032701).

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Authors and Affiliations

  1. Key Laboratory of Maglev Train and Maglev Technology of Ministry of Education, Superconductivity and New Energy R&D Center, Southwest Jiaotong University, Chengdu, 610031, China

    Hong Zhang, Yong Zhao & Yong Zhang

  2. School of Materials Science and Engineering, University of New South Wales, Sydney, 2052, NSW, Australia

    Yong Zhao

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  1. Hong Zhang
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  2. Yong Zhao
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Correspondence to Hong Zhang or Yong Zhao.

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Zhang, H., Zhao, Y. & Zhang, Y. The Effects of Excess Mg Addition on the Superconductivity of MgB2 . J Supercond Nov Magn 28, 2711–2714 (2015). https://doi.org/10.1007/s10948-015-3120-8

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  • DOI: https://doi.org/10.1007/s10948-015-3120-8

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