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
N1 - Funding Information:
Manuscript received October 4, 2004. This work was supported by the New Energy and Industrial Technology Development Organization (NEDO). S. Nariki, N. Sakai, and I. Hirabayashi are with the Superconductivity Research Laboratory, ISTEC, Tokyo 135-0062, Japan (e-mail: nariki@istec.or.jp). M. Murakami is with the Shibaura Institute of Technology, Tokyo 108-8548, Japan. Digital Object Identifier 10.1109/TASC.2005.848970
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
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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 -