Doping effect of Zr and Ti on the critical current density of MgB2 bulk superconductors prepared under ambient pressure

Y. Zhao, Y. Feng, D. X. Huang, T. Machi, C. H. Cheng, K. Nakao, N. Chikumoto, Y. Fudamoto, N. Koshizuka, M. Murakami

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

The doping effect of Ti and Zr on the superconducting properties and the microstructure of sintered MgB2 bulk materials has been studied. The transition metal is found to work as a sintering assistant, which significantly enhances the grain connection of the MgB2 bulk materials during sintering processing. With this technique, we have fabricated Ti-doped MgB2 bulk materials consisting of fine 10 nm scale particles and achieved a high Jc over 1 MA/cm2 in 0 T at 20 K. The large enhancement of Jc is explained by the excellent connection between grains and a high density of pinning centers served by grain boundaries and MgO nanoparticles.

Original languageEnglish
Pages (from-to)122-126
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume378-381
Issue numberPART 1
DOIs
Publication statusPublished - 2002 Oct 1
Externally publishedYes

Keywords

  • Critical currents
  • Flux pinning
  • Metals, alloys and binary compounds

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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