TY - JOUR
T1 - Ti doping on the flux pinning and chemical stability against water of MgB2 bulk material
AU - Zhao, Y.
AU - Cheng, C. H.
AU - Feng, Y.
AU - Machi, T.
AU - Huang, D. X.
AU - Zhou, L.
AU - Koshizuka, N.
AU - Murakami, M.
N1 - Funding Information:
This work was supported in part by the NEDO Japan. Zhao and Cheng also thank the Australian Research Council and UNSW for financial support.
PY - 2003/4/15
Y1 - 2003/4/15
N2 - 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.
AB - 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.
KW - Critical current density
KW - MgB
KW - Microstructure
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U2 - 10.1016/S0921-4534(02)02166-4
DO - 10.1016/S0921-4534(02)02166-4
M3 - Conference article
AN - SCOPUS:0037445656
SN - 0921-4534
VL - 386
SP - 581
EP - 587
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
T2 - ICMC 2002
Y2 - 16 June 2002 through 20 June 2002
ER -