Effect of high-energy ball milling time on superconducting properties of MgB 2 with low purity boron powder

Chengduo Wang, Yanwei Ma, Xianping Zhang, Dongliang Wang, Zhaoshun Gao, Chao Yao, Chunlei Wang, Hidetoshi Oguro, Satoshi Awaji, Kazuo Watanabe

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

MgB 2 bulks and tapes were fabricated using ball-milled precursor powders. The selected B powders have the -rhombohedral crystalline structure as a main phase, with a small amount of MgO impurity. Milling time was tested from 0.5 to 120h to get an optimized value. It is found that ball milling can facilitate MgB 2 phase formation, refine the MgB 2 grains and increase the defect density. Moreover, the active area, B c2 and flux pinning are improved, which is of benefit to the enhancement of J c performance. The 80 h milled MgB 2 bulk sample has a J c value of 2.8×10 4Acm 2 at 5K and 6T, 41 times larger than that of the 0.5h sample. At the same time, the transport J c of the 80h MgB 2 tape reaches 2.3×10 3Acm 2 at 4.2K and 9T, 32 times larger than that of the 0.5h one. Due to the increase of impurities and the release of lattice deformation and strain, the J c was decreased for the sample milled up to 120h.

Original languageEnglish
Article number035018
JournalSuperconductor Science and Technology
Volume25
Issue number3
DOIs
Publication statusPublished - 2012 Mar

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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