화학공학소재연구정보센터
Korean Journal of Materials Research, Vol.24, No.9, 465-468, September, 2014
보론 분말의 결정화에 대한 열처리 영향 MgB2 초전도체의 임계전류밀도 특성
Effect of Heat-Treatment on the Crystallization of B Powder and Critical Current Density Property of MgB2 Superconductor
E-mail:
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 MgB2 bulk superconductors. The semi-crystalline B powder was heattreated at different temperatures of 1000, 1300 and 1500 oC for 5 hours in an Ar atmosphere. Then, using as-received and heattreated B powders, the MgB2 samples were prepared at 600 oC 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 MgB2 samples using B powders heat-treated at above 1300 oC, 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 MgB2 decreased continuously due to the reduction of grain boundary density and superconducting volume caused by unreacted Mg and B.
  1. Nagamatsu J, Nakagawa N, Muranaka T, Zenitani Y, Akimitsu J, Nature, 410(6824), 63 (2001)
  2. Musenich R, Fabbricatore P, Fanciulli C, Ferdeghini C, Grasso G, IEEE Trans. Appl. Supercond., 14, 365 (2004)
  3. Takahashi M, Tanaka K, Okada M, Kitaguchi H, Kumakura H, IEEE Trans. Appl. Supercond., 16, 1431 (2006)
  4. Musenich R, Fabbricatore P, Farinon S, Greco M, Modica M, Marabotto R, Penco R, Razeti M, Nardelli D, Supercond. Sci. Technon., 19, S126 (2006)
  5. Bascunan J, Lee H, Bobrov ES, Hahn S, Iwasa Y, Tomsic M, Rindfleisch M, IEEE trans. Appl, Supercond, 16, 1427 (2006)
  6. Larbalestier D, Gurevich A, felddmann DM, Polyanskii A, Nature, 414, 368 (2001)
  7. Mikheenko P, Martinez E, Bevan A, Abell JS, MacManus-Driscoll JL, Supercond. Sci. Technol., 20, S264 (2007)
  8. Yamamoto A, SHimoyama J, Ueda S, Katsura Y, Horii S, Kishio K, Supercond. Sci. Technol., 18, 116 (2005)
  9. Jun BH, Kim NK, Tan KS, Kim CJ, J. Alloys Compd., 492, 446 (2010)
  10. Jun BH, Park SD, Kim CJ, J. Alloys Compd., 535, 27 (2012)
  11. Williamson GK, Hall WH, Metall A, Acta Metall., 1, 22 (1953)