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

doi:10.1063/1.1456969

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

Research output: Contribution to journal › Article › peer-review

76 Citations (Scopus)

Abstract

The microstructure of the Ti-doped MgB₂ which shows a significantly improved critical current density, J_c [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 J_c in the Ti-doped MgB₂ bulk superconductor.

Original language	English
Pages (from-to)	1640-1642
Number of pages	3
Journal	Applied Physics Letters
Volume	80
Issue number	9
DOIs	https://doi.org/10.1063/1.1456969
Publication status	Published - 2002 Mar 4
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Nanoparticle structure of MgB2 with ultrathin TiB2 grain boundaries",

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.",

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T1 - Nanoparticle structure of MgB2 with ultrathin TiB2 grain boundaries

AU - Zhao, Y.

AU - Huang, D. X.

AU - Feng, Y.

AU - Cheng, C. H.

AU - MacHi, T.

AU - Koshizuka, N.

AU - Murakami, M.

PY - 2002/3/4

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N2 - 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.

AB - 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.

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