Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Superconducting properties and microstructure of electron beam irradiated MgB2 superconductors

  • Kim, C.J. (Korea Atomic Energy Research Institute) ;
  • Lee, Y.J. (Korea Atomic Energy Research Institute) ;
  • Cho, I.H. (Gwangju Institute of Science and Technology) ;
  • Jun, B.H. (Korea Atomic Energy Research Institute)
  • Received : 2022.03.22
  • Accepted : 2022.03.30
  • Published : 2022.03.31
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Abstract

The effect of electron beam (EB) irradiation on superconducting properties and microstructures of MgB2 bulk superconductors were investigated. At E-beam doses of 1×1016 e/cm2 and 1×1017 e/cm2, the effect of irradiation on a superconducting transition temperature (Tc) of MgB2 was weak. As a dose increases to 5×1017 e/cm2, Tc decreases by 0.5 K. The critical current density (Jc) measured at 4.2 K and 20 K, and 0 T - 5 T increases slightly as exposure time increases. X-ray diffraction for the irradiation surface of MgB2 shows that the diffraction intensity of (hkl) peaks decreases proportionally as the exposure time increases. This indicates that the crystallinity of MgB2 was degraded by irradiation. TEM investigation for the irradiated sample showed distorted lattice structure, which is consistent with the XRD results. The Jc increase and Tc reduction of MgB2 by irradiation are believed to be caused by the lattice distortion.

Keywords

Acknowledgement

This work was supported by the National Research Foundation Grant (NRF-2020M2D8A2047959) funded from Ministry of Science and ICT(MSIT) of Republic of Korea.

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