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Superconducting Properties of Mg(B1-xCx)2 Bulk Synthesized Using Magnesium and Glycerin-treated Boron Powder

마그네슘과 글리세린 처리한 붕소 분말로 합성한 Mg(B1-xCx)2의 초전도 특성

  • Kim, Yi-Jeong (Neutron Science Division, Korea Atomic Energy Research Institute) ;
  • Jun, Byung-Hyuk (Neutron Science Division, Korea Atomic Energy Research Institute) ;
  • Park, Soon-Dong (Neutron Science Division, Korea Atomic Energy Research Institute) ;
  • Tan, Kai Sin (Neutron Science Division, Korea Atomic Energy Research Institute) ;
  • Kim, Bong-Goo (Research Reactor Engineering Division, Korea Atomic Energy Research Institute) ;
  • Sohn, Jae-Min (Research Reactor Engineering Division, Korea Atomic Energy Research Institute) ;
  • Kim, Chan-Joong (Neutron Science Division, Korea Atomic Energy Research Institute)
  • 김이정 (한국원자력연구원 중성자과학연구부) ;
  • 전병혁 (한국원자력연구원 중성자과학연구부) ;
  • 박순동 (한국원자력연구원 중성자과학연구부) ;
  • 탄카이신 (한국원자력연구원 중성자과학연구부) ;
  • 김봉구 (한국원자력연구원 연구로공학부) ;
  • 손재민 (한국원자력연구원 연구로공학부) ;
  • 김찬중 (한국원자력연구원 중성자과학연구부)
  • Published : 2008.06.28

Abstract

Carbon was known to be one of effective additives which can improve the flux pinning of $MgB_2$ at high magnetic fields. In this study, glycerin $(C_3H_8O_3)$ was selected as a chemical carbon source for the improvement of critical current density of $MgB_2$. In order to replace some of boron atoms by carbon atoms, the boron powder was heat-treated with liquid glycerin. The glycerin-treated boron powder was mixed with an appropriate amount of magnesium powder to $MgB_2$ composition and the powder pallets were heat treated at $650^{\circ}C\;and\;900^{\circ}C$ for 30 min in a flowing argon gas. It was found that the superconducting transition temperature $(T_c)$ of $Mg(B_{1-x}C_x)_2$ prepared using glycerin-treated boron powder was 36.6 K, which is slightly smaller than $T_c$(37.1 K) of undoped $MgB_2$. The critical current density $(J_c)$ of $Mg(B_{1-x}C_x)_2$ was higher than that of undoped $MgB_2$ and the $T_c$ improvement effect was more remarkable at higher magnetic fields. The $T_c$, decrease and $J_c$ increase associated with the glycerin treatment for boron powder was explained in terms of the carbon substitution to boron site.

Keywords

References

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