Earticle

초록

영어

The effect of electron beam (EB) irradiation on superconducting properties and microstructures of MgB2 bulk superconductors were investigated. At E-beam doses of 1x1016 e/cm2 and 1x1017 e/cm2, the effect of irradiation on a superconducting transition temperature (Tc) of MgB2 was weak. As a dose increases to 5x1017 e/cm2, Tc decreases by 0.5 K. The critical current density (Jc) measured at 4.2 K and 20 K, and 0 T - 5 T increases slightly as exposure time increases. X-ray diffraction for the irradiation surface of MgB2 shows that the diffraction intensity of (hkl) peaks decreases proportionally as the exposure time increases. This indicates that the crystallinity of MgB2 was degraded by irradiation. TEM investigation for the irradiated sample showed distorted lattice structure, which is consistent with the XRD results. The Jc increase and Tc reduction of MgB2 by irradiation are believed to be caused by the lattice distortion.

목차

Abstract
1. INTRODUCTION
2. EXPERIMENTS
3. RESULTS AND DISCUSSION
3.1 Temperature-magnetic moment curves
3.2 Critical current density
3.3 X-ray diffraction analysis
4. CONCLUSION
ACKNOWLEDGMENTS
REFERENCES

키워드

저자

• C.-J. Kim [ Korea Atomic Energy Research Institute ] Corresponding Author
• Y. J. Lee [ Korea Atomic Energy Research Institute ]
• I. H. Cho [ Gwangju Institute of Science and Technology ]
• B.-H. Jun [ Korea Atomic Energy Research Institute ]

참고문헌

발행기관

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