Hollow carbon spheres as an efficient dopant for enhancing the critical current density of MgB2-based tapes

Zhaoshun Gao, Yanwei Ma, Xianping Zhang, Dongliang Wang, Junhong Wang, S. Awaji, K. Watanabe, Boyang Liu

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

A significant enhancement of critical current density (Jc) and Hirr in MgB2 tapes has been achieved by the in situ powder-in-tube method utilizing hollow carbon spheres (HCS) as dopants. At 4.2 K, the transport Jc for the 850 °C sintered samples reached 3.1 × 104 and 1.4 × 104 A cm-2 at 10 and 12 T, respectively, and were better than those of optimal nano-SiC-doped tapes. The effects of different sintering temperature on lattice parameters, amount of carbon substitution, microstructure and Jc of doped samples were also investigated. These results demonstrate that HCS is one of the most promising dopants besides nano-carbon and SiC for the enhancement of current capacity for MgB2 in high fields.

Original languageEnglish
Article number105020
JournalSuperconductor Science and Technology
Volume21
Issue number10
DOIs
Publication statusPublished - 2008 Oct 1

ASJC Scopus subject areas

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

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