한국분말야금학회지 Vol. 26 No. 5 (p.432-436)

MgB2 초전도체의 임계특성에 대한 Fe 입자 크기의 영향

The Influence of Fe Particle Size on the Critical Properties of MgB2 Superconductor
키워드 :
Superconductor,MgB2,Fe addition,Fe particle size,Critical properties

목차

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

초록

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.