Nanoparticle structure of MgB[sub 2] with ultrathin TiB[sub 2] grain boundaries

Zhao, Y.; Huang, D. X.; Feng, Y.; Cheng, C. H.; Machi, T.; Koshizuka, N.; Murakami, M.
March 2002
Applied Physics Letters;3/4/2002, Vol. 80 Issue 9, p1640
Academic Journal
The microstructure of the Ti-doped MgB[sub 2] which shows a significantly improved critical current density, J[sub c] [Appl. Phys. Lett. 79, 1154 (2001)], is investigated. It is found that Ti does not occupy the atomic site in the MgB[sub 2] crystal structure, but forms a thin TiB[sub 2] layer (with a thickness about one unit cell of TiB[sub 2]) in the grain boundaries of MgB[sub 2]. Besides, MgB[sub 2] grains are greatly refined by Ti doping, forming a strongly coupled nanoparticle structure. It is argued that the unique microstructure of the MgB[sub 2] nanoparticles with TiB[sub 2] nanograin boundaries may take responsibility for the enhancement of J[sub c] in the Ti-doped MgB[sub 2] bulk superconductor.


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