Abstract
We have investigated the superconducting properties of (Gd, Y)-Ba-Cu-O bulk superconductors fabricated from precursors of Gd123-Y211 in a reduced oxygen atmosphere. The employment of ball-milled ultra-fine Y211 powder as a precursor material was very effective in enhancing critical current density (J c), since RE211 inclusions in the melt-textured samples could be drastically refined with decreasing the particle size of Y211 starting powder. The maximum Jc value reached an extremely high value of 380 kA/cm2 at 77 K in self-field. However, size reduction of RE211 led to inhomogeneous distribution of RE211 inclusions. The trapped magnetic fields of Ag-added single-grain samples 25 mm and 33 mm in diameters were 1.5 T and 2.0 T at 77 K, respectively.
| Original language | English |
|---|---|
| Pages (from-to) | 3110-3113 |
| Number of pages | 4 |
| Journal | IEEE Transactions on Applied Superconductivity |
| Volume | 15 |
| Issue number | 2 PART III |
| DOIs | |
| Publication status | Published - 2005 Jun |
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Keywords
- Current density
- Gadolinium compounds
- Superconducting materials
- Yttrium compounds
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Physics and Astronomy (miscellaneous)
Cite this
Processing of high-performance (Gd, Y)-Ba-Cu-O bulk superconductors with fine RE211 pinning centers. / Nariki, Shinya; Sakai, Naomichi; Murakami, Masato; Hirabayashi, Izumi.
In: IEEE Transactions on Applied Superconductivity, Vol. 15, No. 2 PART III, 06.2005, p. 3110-3113.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Processing of high-performance (Gd, Y)-Ba-Cu-O bulk superconductors with fine RE211 pinning centers
AU - Nariki, Shinya
AU - Sakai, Naomichi
AU - Murakami, Masato
AU - Hirabayashi, Izumi
PY - 2005/6
Y1 - 2005/6
N2 - We have investigated the superconducting properties of (Gd, Y)-Ba-Cu-O bulk superconductors fabricated from precursors of Gd123-Y211 in a reduced oxygen atmosphere. The employment of ball-milled ultra-fine Y211 powder as a precursor material was very effective in enhancing critical current density (J c), since RE211 inclusions in the melt-textured samples could be drastically refined with decreasing the particle size of Y211 starting powder. The maximum Jc value reached an extremely high value of 380 kA/cm2 at 77 K in self-field. However, size reduction of RE211 led to inhomogeneous distribution of RE211 inclusions. The trapped magnetic fields of Ag-added single-grain samples 25 mm and 33 mm in diameters were 1.5 T and 2.0 T at 77 K, respectively.
AB - We have investigated the superconducting properties of (Gd, Y)-Ba-Cu-O bulk superconductors fabricated from precursors of Gd123-Y211 in a reduced oxygen atmosphere. The employment of ball-milled ultra-fine Y211 powder as a precursor material was very effective in enhancing critical current density (J c), since RE211 inclusions in the melt-textured samples could be drastically refined with decreasing the particle size of Y211 starting powder. The maximum Jc value reached an extremely high value of 380 kA/cm2 at 77 K in self-field. However, size reduction of RE211 led to inhomogeneous distribution of RE211 inclusions. The trapped magnetic fields of Ag-added single-grain samples 25 mm and 33 mm in diameters were 1.5 T and 2.0 T at 77 K, respectively.
KW - Current density
KW - Gadolinium compounds
KW - Superconducting materials
KW - Yttrium compounds
UR - http://www.scopus.com/inward/record.url?scp=22144464069&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=22144464069&partnerID=8YFLogxK
U2 - 10.1109/TASC.2005.848970
DO - 10.1109/TASC.2005.848970
M3 - Article
AN - SCOPUS:22144464069
VL - 15
SP - 3110
EP - 3113
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 2 PART III
ER -