Significant improvement in critical current densities of C-doped MgB 2 tapes made by high-energy ball milling

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

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

C-doped MgB 2 tapes were fabricated using crystalline boron as one of the ball milled precursor powders. It was found that the ball milling process can strongly enhance the J c values of MgB 2 tapes and reduce the anisotropy of the J c. At 4.2K, the transport J c of the 80h milled C-doped MgB 2 tapes sintered at 800°C reaches 4.3×10 4Acm 2 at 10T and 2.2×10 4Acm 2 at 12T, respectively. These values are even higher than for tapes made from amorphous B powders. Ball milling can improve not only the upper critical field, by increasing the C substitution level in the MgB 2 lattice, but also the flux pinning, by increasing grain boundaries, both of which result in the enhancement of J c performance. Moreover, the high MgB 2 phase fraction and large density of milled MgB 2 tapes are beneficial to the active area. These results indicate that the use of crystalline B in combination with a ball milling process may be an economic method to harness the excellent properties of MgB 2 for practical applications.

Original languageEnglish
Article number075010
JournalSuperconductor Science and Technology
Volume25
Issue number7
DOIs
Publication statusPublished - 2012 Jul

ASJC Scopus subject areas

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

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