Ti doping on the flux pinning and chemical stability against water of MgB2 bulk material

Y. Zhao, C. H. Cheng, Y. Feng, T. Machi, D. X. Huang, L. Zhou, N. Koshizuka, M. Murakami

Research output: Contribution to journalConference articlepeer-review

10 Citations (Scopus)

Abstract

Ti-doped MgB2 superconductors with different doping levels were prepared by solid-state reaction at ambient pressure. Jc of the samples changes with the doping level, with the best result achieved at x = 0.1. At 5 K, the Jc reaches 2 × 106 A/cm2 in the self-field. In addition, degradation in water of Jc and irreversibility field (Hirr) of MgB2 bulks is significantly reduced by Ti doping. Microstructural analysis reveals that Ti mainly forms a thin TiB2 layer in the grain boundaries of MgB2. At the same time MgB2 grains are greatly refined, forming a strongly coupled nanoparticle structure. Our results show that the unique microstructure of the MgB2 nanoparticles with TiB2 nanograin boundaries may take the responsibility for the enhancement of the flux pinning and the chemical stability against water.

Original languageEnglish
Pages (from-to)581-587
Number of pages7
JournalPhysica C: Superconductivity and its applications
Volume386
DOIs
Publication statusPublished - 2003 Apr 15
Externally publishedYes
EventICMC 2002 - Xi an, China
Duration: 2002 Jun 162002 Jun 20

Keywords

  • Critical current density
  • MgB
  • Microstructure

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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