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Superconducting properties of MgB2 superconductors in-situ processed using various boron powder mixtures
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- 발행기관
- 한국초전도저온학회 (구 한국초전도저온공학회) 바로가기
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- 간행물
- 한국초전도·저온논문지 (구 한국초전도저온공학회논문지) KCI 등재 SCOPUS 바로가기
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- 통권
- 23권 3호 (2021.09)바로가기
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- 페이지
- pp.45-50
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- 저자
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- 언어
- 영어(ENG)
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- URL
- https://www.earticle.net/Article/A404555
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4,000원
원문정보
초록
- 영어
- In this study, the effect of the size of B powder on the critical current density (Jc) of MgB2 prepared by an in situ reaction process was investigated. Various combinations of B powders were made using a micron B, ball-milled B and nano B powders. Micron B powder was reduced by ball milling and the milled B powder was mixed with the micron B or nano B powder. The mixing ratios of the milled B and micron or nano B were 100:0, 50:50 and 0:100. Non-milled micron B powder was also mixed with nano powder in the same ratios. Pellets of (2B+Mg) prepared with various B mixing ratios were heat-treated to form MgB2. Tc of MgB2 decreased slightly when the milled B was used, whereas the Jc of MgB2 increased with increasing amount of the milled B or the nano powder. The used of the milled B and nano B power promoted the formation MgB2 during heat treatment. In addition to the enhanced formation of MgB2, the use of the powders reduced the grain size of MgB2. The use of the milled and nano B powder increased the Jc of MgB2. The highest Jc was achieved when 100% nano B powder was used. The Jc enhancement is attributed to the high volume fraction of the superconducting phase (MgB2) and the large grain boundaries, which induces the flux pinning at the magnetic fields.
목차
Abstract
1. INTRODUCTION
2. EXPERIMENTAL PROCEDURE
2.1. Raw Powders
2.2. Mixing of powders and Synthesis of MgB2
3. RESULTS AND DISCUSSION
4. CONCLUSIONS
ACKNOWLEDGMENT
REFERENCES
키워드
MgB2 in-situ process B powder milling powder size grain size superconducting transition temperature critical current density apparent density phase formation저자
간행물 정보
발행기관
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- 발행기관명
- 한국초전도저온학회 (구 한국초전도저온공학회) [The Korean Society of Superconductivity and Cryogenics (KSSC)]
- 설립연도
- 1998
- 분야
- 공학>전기공학
- 소개
- 21세기 핵심기술인 초전도공학과 저온공학분야의 기술 수준을 향상시키고, 선진 외국의 관련 학회와의 국제 교류 뿐만 아니라 이 분야에서 산.학.연의 학술활동 및 기술교류의 구심점으로의 그 역할을 성실히 수행하고자 한다.
간행물
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- 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
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