Earticle

초록

영어

The effects of the heat treatment temperature (600℃-1050℃) on the formation of MgB2 and the superconducting properties have been examined. The self-synthesized MgB4 and commercial Mg powders were used as raw materials for the formation of MgB2. The superconducting critical temperatures (Tcs) of MgB2 bulk superconductors prepared at 600℃-850℃ were as high as 37-38 K regardless of the heat treatment temperature. However, because MgB4 is more stable than MgB2 at above 850℃, no superconducting signals were detected in the susceptibility-temperature curves of the samples prepared above 850℃. As for the critical current density (Jc), the sample heat-treated at a low temperature (600℃) for a prolonged period (40 h) showed a Jc higher than those prepared at 650℃-850℃ for a short period (1 h). The FWHM (full width at half maximum) result showed that the grain size of MgB2 of the 600℃ sample was smaller than that of the other samples. The high Jc of the 600℃sample is attributed to the presence of large numbers of grain boundaries, which can act as flux pinning centers of MgB2.

목차

Abstract
 1. INTRODUCTION
 2. EXPERIMENTAL PROCEDURE
 3. RESULTS AND DISCUSSION
 4. CONCLUSIONS
 ACKNOWLEDGMENT
 REFERENCES

키워드

저자

• S. H. Kim [ Korea Atomic Energy Research Institute, Sungkyunkwan University, Suwon, Korea ]
• W. N. Kang [ Sungkyunkwan University, Suwon, Korea ]
• Y. J. Lee [ Korea Atomic Energy Research Institute, Sungkyunkwan University, Suwon, Korea ]
• B.-H. Jun [ Korea Atomic Energy Research Institute, Daejeon, Korea ]
• C.-J. Kim [ Korea Atomic Energy Research Institute, Daejeon, Korea ] Corresponding author

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