Abstract
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 language | English |
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Pages (from-to) | 1640-1642 |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 80 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2002 Mar 4 |
Externally published | Yes |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)