Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Heat-Treatment on the Crystallization of B Powder and Critical Current Density Property of MgB2 Superconductor

보론 분말의 결정화에 대한 열처리 영향과 MgB2 초전도체의 임계전류밀도 특성

  • You, Byung Youn (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute) ;
  • Kim, Chan-Joong (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute) ;
  • Park, Soon-Dong (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute) ;
  • Jun, Byung-Hyuk (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute)
  • 유병윤 (한국원자력연구원 중성자응용기술부) ;
  • 김찬중 (한국원자력연구원 중성자응용기술부) ;
  • 박순동 (한국원자력연구원 중성자응용기술부) ;
  • 전병혁 (한국원자력연구원 중성자응용기술부)
  • Received : 2014.05.30
  • Accepted : 2014.07.31
  • Published : 2014.09.27
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Abstract

The crystallization effects of boron (B) powder on the phase, full width at half maximum (FWHM) values, and critical properties were investigated for in-situ reacted $MgB_2$ bulk superconductors. The semi-crystalline B powder was heat-treated at different temperatures of 1000, 1300 and $1500^{\circ}C$ for 5 hours in an Ar atmosphere. Then, using as-received and heat-treated B powders, the $MgB_2$ samples were prepared at $600^{\circ}C$ for 40 hours in an Ar atmosphere. As the heat-treatment temperature of the B powder increased, both the particle size of the B powder and crystalline phase increased. In the case of $MgB_2$ samples using B powders heat-treated at above $1300^{\circ}C$, unreacted magnesium (Mg) and B remained due to the improved crystallinity of the B powder. As the heat-treatment temperature of B powder increased, the critical current density of $MgB_2$ decreased continuously due to the reduction of grain boundary density and superconducting volume caused by unreacted Mg and B.

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References

  1. J. Nagamatsu, N. Nakagawa, T. Muranaka, Y. Zentitani, and J. Akimitsu, Nature 410, 63 (2001). https://doi.org/10.1038/35065039
  2. R. Musenich, P. Fabbricatore, C. Fanciulli, C. Ferdeghini, and G. Grasso, IEEE Trans. Appl. Supercond. 14, 365 (2004). https://doi.org/10.1109/TASC.2004.829671
  3. M. Takahashi, K. Tanaka, M. Okada, H. Kitaguchi, and H. Kumakura, IEEE Trans. Appl. Supercond. 16, 1431 (2006). https://doi.org/10.1109/TASC.2006.869993
  4. R. Musenich, P. Fabbricatore, S. Farinon, M. Greco, M. Modica, R. Marabotto, R. Penco, M. Razeti, and D. Nardelli, Supercond. Sci. Technon. 19, S126 (2006). https://doi.org/10.1088/0953-2048/19/3/018
  5. J. Bascuan, H. Lee, E. S. Bobrov, S. Hahn, Y. Iwasa, M. Tomsic, and M. Rindfleisch, IEEE trans. Appl, Supercond 16, 1427 (2006). https://doi.org/10.1109/TASC.2005.864456
  6. D. Larbalestier, A. Gurevich, D.M felddmann, and A Polyanskii, Nature 414, 368 (2001) . https://doi.org/10.1038/35104654
  7. P. Mikheenko, E. Martínez, A. Bevan, J. S. Abell, and J. L. MacManus-Driscoll, Supercond. Sci. Technol. 20, S264 (2007). https://doi.org/10.1088/0953-2048/20/9/S22
  8. A. Yamamoto, J. Shimoyama, S. Ueda, Y. Katsura, S. Horii, and K. Kishio, Supercond. Sci. Technol. 18, 116 (2005). https://doi.org/10.1088/0953-2048/18/1/019
  9. B. -H. Jun, N. K Kim, K. S. Tan, and C. -J. Kim, J. Alloys Compd. 492, 446 (2010). https://doi.org/10.1016/j.jallcom.2009.11.134
  10. B. -H. Jun, S. D. Park, and C. -J. Kim, J. Alloys Compd. 535, 27 (2012). https://doi.org/10.1016/j.jallcom.2012.04.030
  11. G. K. Williamson, and W. H. Hall, Acta Metall. 1, 22 (1953). https://doi.org/10.1016/0001-6160(53)90006-6