Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 581-587 |
| Number of pages | 7 |
| Journal | Physica C: Superconductivity and its Applications |
| Volume | 386 |
| DOIs | |
| Publication status | Published - 2003 Apr 15 |
| Externally published | Yes |
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Keywords
- Critical current density
- MgB
- Microstructure
ASJC Scopus subject areas
- Condensed Matter Physics
Cite this
Ti doping on the flux pinning and chemical stability against water of MgB2 bulk material. / Zhao, Y.; Cheng, C. H.; Feng, Y.; Machi, T.; Huang, D. X.; Zhou, L.; Koshizuka, N.; Murakami, Masato.
In: Physica C: Superconductivity and its Applications, Vol. 386, 15.04.2003, p. 581-587.Research output: Contribution to journal › Article
}
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, Masato
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
UR - http://www.scopus.com/inward/record.url?scp=0037445656&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0037445656&partnerID=8YFLogxK
U2 - 10.1016/S0921-4534(02)02166-4
DO - 10.1016/S0921-4534(02)02166-4
M3 - Article
VL - 386
SP - 581
EP - 587
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
ER -