Microstructural and crystallographic imperfections of MgB2 superconducting wire and their correlation with the critical current density

Mohammed Shahabuddin, Nasser S. Alzayed, Sangjun Oh, Seyong Choi, Minoru Maeda, Satoshi Hata, Yusuke Shimada, Md Shahriar Al Hossain, Jung Ho Kim

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Abstract

A comprehensive study of the effects of structural imperfections in MgB2 superconducting wire has been conducted. As the sintering temperature becomes lower, the structural imperfections of the MgB2 material are increased, as reflected by detailed X-ray refinement and the normal state resistivity. The crystalline imperfections, caused by lattice disorder, directly affect the impurity scattering between the π and σ bands of MgB2, resulting in a larger upper critical field. In addition, low sintering temperature keeps the grain size small, which leads to a strong enhancement of pinning, and thereby, enhanced critical current density. Owing to both the impurity scattering and the grain boundary pinning, the critical current density, irreversibility field, and upper critical field are enhanced. Residual voids or porosities obviously remain in the MgB2, however, even at low sintering temperature, and thus block current transport paths.

Original languageEnglish
Article number017113
JournalAIP Advances
Volume4
Issue number1
DOIs
Publication statusPublished - Jan 2014

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Shahabuddin, M., Alzayed, N. S., Oh, S., Choi, S., Maeda, M., Hata, S., Shimada, Y., Hossain, M. S. A., & Kim, J. H. (2014). Microstructural and crystallographic imperfections of MgB2 superconducting wire and their correlation with the critical current density. AIP Advances, 4(1), [017113]. https://doi.org/10.1063/1.4862670