Nanoparticle structure of MgB2 with ultrathin TiB2 grain boundaries

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

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The microstructure of the Ti-doped MgB2 which shows a significantly improved critical current density, Jc [Appl. Phys. Lett. 79, 1154 (2001)], is investigated. It is found that Ti does not occupy the atomic site in the MgB2 crystal structure, but forms a thin TiB 2 layer (with a thickness about one unit cell of TiB2) in the grain boundaries of MgB2. Besides, MgB2 grains are greatly refined by Ti doping, forming a strongly coupled nanoparticle structure. It is argued that the unique microstructure of the MgB2 nanoparticles with TiB2 nanograin boundaries may take responsibility for the enhancement of Jc in the Ti-doped MgB2 bulk superconductor.

Original languageEnglish
Pages (from-to)1640-1642
Number of pages3
JournalApplied Physics Letters
Issue number9
Publication statusPublished - 2002 Mar 4
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Zhao, Y., Huang, D. X., Feng, Y., Cheng, C. H., MacHi, T., Koshizuka, N., & Murakami, M. (2002). Nanoparticle structure of MgB2 with ultrathin TiB2 grain boundaries. Applied Physics Letters, 80(9), 1640-1642.