Strong influence of precursor powder on the critical current density of Fe-sheathed MgB2 tapes

Dongliang Wang, Yanwei Ma, Zhengguang Yu, Zhaoshun Gao, Xianping Zhang, K. Watanabe, E. Mossang

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

The effect of the quality of starting powders on the microstructure and superconducting properties of insitu processed Fe-sheathed MgB2 tapes has been investigated. Three different types of commercial atomized spherical magnesium powder and two different purities of amorphous boron powder were employed. When using the 10νm magnesium as precursor powders, the Mg reacted with boron more uniformly and quickly; thus the uniformity of the fabricated MgB2 was improved and the grain size of the MgB2 was decreased. Hence significant critical current density (Jc) enhancements were achieved for MgB2 tapes. Jc at 4.2K for MgB2 tapes made from the 10νm Mg and high purity boron powders was at least a factor of ten higher than values measured for MgB2 samples made from all other starting powders. At 20K, 5T, the typical J c values of the tapes were over 1.0 × 104Acm -2 and were much better than those of tape samples reported recently.

Original languageEnglish
Article number015
Pages (from-to)574-578
Number of pages5
JournalSuperconductor Science and Technology
Volume20
Issue number6
DOIs
Publication statusPublished - 2007 Jun 1

ASJC Scopus subject areas

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

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