보론 분말의 결정화에 대한 열처리 영향 MgB2 초전도체의 임계전류밀도 특성

유병윤; 김찬중; 박순동; 전병혁; Byung Youn You; Chan-Joong Kim; Soon-Dong Park; Byung-Hyuk Jun

Korean Journal of Materials Research, Vol.24, No.9, 465-468, September, 2014

DOI10.3740/MRSK.2014.24.9.465 Export Citation

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

유병윤, 김찬중, 박순동, 전병혁^†

한국원자력연구원 중성자응용기술부

Byung Youn You, Chan-Joong Kim, Soon-Dong Park, and Byung-Hyuk Jun^†

Neutron Utilization Technology Division, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero, Yuseong-gu, Daejeon 305-353, Korea

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.

Keywords:MgB2 superconductor;B powder;heat-treatment;crystallization;critical current density

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[6] Larbalestier D, Gurevich A, felddmann DM, Polyanskii A, Nature, 414, 368 (2001)

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[8] Yamamoto A, SHimoyama J, Ueda S, Katsura Y, Horii S, Kishio K, Supercond. Sci. Technol., 18, 116 (2005)

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