This study demonstrates the effect of addition of Fe particles of different sizes on the critical properties of the superconductor MgB2. Bulk MgB2 is synthesized by ball milling Mg and B powders with Fe particles at 900oC. When Fe particles with size less than 10 μm are added in MgB2, they easily react with B and form the FeB phase, resulting in a reduction in the amount of the MgB2 phase and deterioration of the crystallinity. Accordingly, both the critical temperature and the critical current density are significantly reduced. On the other hand, when larger Fe particles are added, the Fe2B phase forms instead of FeB due to the lower reactivity of Fe toward B. Accordingly, negligible loss of B occurs, and the critical properties are found to be similar to those of the intact MgB2.

Abstract
1. 서 론
2. 실험방법
3. 결 과
4. 결 론
References

• 정현덕(한국세라믹기술원 엔지니어링세라믹센터) | Hyeondeok Jeong (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
• 이동건(㈜삼동 기술연구소) | Dong-Gun Lee (Sam Dong Co., Ltd., R&D Center)
• 류성수(한국세라믹기술원 엔지니어링세라믹센터) | Sung-Soo Ryu (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
• 박해웅(한국기술교육대학교 신소재공학과) | Hai-Woong Park (Department of Materials Engineering, Korea University of Technology Education)
• 김찬중(한국원자력연구원 중성자동위원소응용연구부) | Chan-Joong Kim (Neutron and Radioisotope Application Research Division, Korea Atomic Energy Research Institute)
• 전병혁(한국원자력연구원 중성자동위원소응용연구부) | Byung-Hyuk Jun (Neutron and Radioisotope Application Research Division, Korea Atomic Energy Research Institute) Corresponding Author