Enhanced superconducting properties of MgB2 tapes achieved by treating B powder with glycolic acid

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

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

MgB2 tapes were fabricated by the in situ powder-in-tube method using C2H4O3-treated B powder as a source material. It is found that the Jc values of MgB2 tapes are significantly improved by treating B powder with C2H 4O3. At 4.2K, the Jc of the C2H 4O3-treated sample sintered at 800 °C reaches 5 × 103Acm-2 at 12T. The C2H 4O3-treated B improves not only the upper critical field through enhancing intraband scattering but also the flux pinning by increasing grain boundaries and C substitution effects. A larger amount of intragranular structural defects and grain boundaries were found in the C2H 4O3-treated MgB2 matrix. Benefiting from the good crystallinity, the C2H4O3-treated tape sintered at 800 °C shows a bigger active area fraction and a higher J c than the sample sintered at 700 °C. These results suggest that treating B powder with C2H4O3 is an effective way to enhance the critical current density of MgB2 superconductors.

Original languageEnglish
Article number105005
JournalSuperconductor Science and Technology
Volume24
Issue number10
DOIs
Publication statusPublished - 2011 Sep 29

ASJC Scopus subject areas

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

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