Earticle

초록

영어

Since the MgB2 superconductor is simply composed of two constituents of Mg and B, its performance can be monitored easily with the change of one ingredient compared to the other. With the powder size of B less than 100 nm, two different sizes of Mg powders are used to investigate the reaction temperature dependence of MgB2 bulk samples. In the range of 630-700oC for the duration of 30 min., the un-reacted Mg is seen only at 630oC with Mg powder size of <5 μm, whereas Mg traces are detected at all the temperature range with Mg powder size of <45 μm. The reaction temperature dependence of MgB2 superconducting transition temperature, Tc, shows little difference whether Mg powder size is large or small in this range except for the 630oC. It is worthy of notice that the critical current densities of MgB2 show higher performance with the small size of Mg compared to the large one at all field ranges. With the Mg powder size of <45 μm, flux pinning is enhanced with decreasing the reaction temperature, whereas flux pinning properties is quite similar in the Mg powder size of <5 μm except for the 630oC, where Mg is left behind after the reaction.

목차

Abstract
1. 서론
2. 실험
3. 결과 및 토론
4. 결론
ACKNOWLEDGMENT
REFERENCES

키워드

저자

• K. C. Chung [ Korea Institute of Materials Science, Changwon, 51508 Korea ] Corresponding author

참고문헌

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간행물

표지보기 관심저널 등록

• 간행물명

  한국초전도·저온논문지 (구 한국초전도저온공학회논문지) [Progress in Superconductivity and Cryogenics]

• 간기

  계간

• pISSN

  1229-3008

• eISSN

  2287-6251

• 수록기간

  1999~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 427 DDC 537