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

研究成果: Conference article査読

10 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)581-587
ページ数7
ジャーナルPhysica C: Superconductivity and its applications
386
DOI
出版ステータスPublished - 2003 4 15
外部発表はい
イベントICMC 2002 - Xi an, China
継続期間: 2002 6 162002 6 20

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

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