한국초전도ㆍ저온공학회논문지 (Progress in Superconductivity and Cryogenics)

  • 제24권4호
  • /
  • Pages.55-58
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  • 2022
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  • 1229-3008(pISSN)
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  • 2287-6251(eISSN)
한국초전도저온학회 (The Korean Society of Superconductivity and Cryogenics)
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Enhanced superconducting properties of MgB2 by doping the carbon quantum dots

  • K.C., Chung (Korea Institute of Materials Science) ;
  • S.H., Jang (Kiswire Advanced Technology Ltd) ;
  • Y.S., Oh (Korea Institute of Materials Science) ;
  • S.H., Kang (Korea Institute of Materials Science)
  • 투고 : 2022.11.28
  • 심사 : 2022.12.28
  • 발행 : 2022.12.31
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초록

Carbon-based doping to MgB2 superconductor is the simplest approach to enhance the critical current densities under magnetic fields. Carbon quantum dots is synthesized in this work as a carbon provider to MgB2 superconductors. Polyvinyl Pyrrolidone is pyrolyzed and dispersed in dimethylfomamide solvent as a dopant to the mixture of Mg and B powders. Doped MgB2 bulk samples clearly show the decrease of a-axis lattice constant, grain refinements, and broadening of FWHM of diffraction peaks compared to un-doped MgB2 possibly due to the carbon substitution and/or boron vacancy at the boron site in MgB2 lattice. Also, high-field Jc for the doped MgB2 is enhanced significantly with the crossover about 3 T at 5 & 20 K when increasing the doping of carbon quantum dots.

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과제정보

This work was supported by Industrial Technology Innovation Program (Grant No. 10053590) funded by the Ministry of Trade, Industry and Energy (MOTIE), Korea.

참고문헌

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