The critical current properties of 37-filament internal Mg diffusion-processed MgB2 wires

S. J. Ye, A. Matsumoto, K. Togano, T. Ohmura, H. Kumakura

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Internal Mg diffusion (IMD)-processed MgB2 wires are known to have a high-density MgB2 core, which obviously leads to high critical current density (Jc). In this work, we first fabricated 37-filament MgB2 wires by IMD processing, and we found that Jc for SiC-added 37-filament IMD-processed MgB2 wires achieved a value of 7.6 × 104 A cm-2 at 4.2 K and 10 T, which is higher than those of multi-filament wires with a smaller number of filaments (1 filament, 7 filaments) fabricated under the same conditions. We also investigated the critical current properties of both undoped and SiC-added 37-filament IMD-processed MgB2 wires under different magnetic fields and temperatures. The undoped 37-filament IMD-processed MgB2 wires achieved Jc value of 1.6 × 105 A cm-2 at 20 K and 3 T. The engineering critical current density (Je) achieved 2.8 × 103 A cm-2 at 20 K and 3 T. The microstructures observed by scanning electron microscopy support the view that the decrease in unreacted B particles by the short diffusion distance is mainly responsible for the high Jc obtained.

Original languageEnglish
Article number105027
JournalSuperconductor Science and Technology
Volume26
Issue number10
DOIs
Publication statusPublished - 2013 Oct
Externally publishedYes

ASJC Scopus subject areas

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

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