TY - JOUR
T1 - Effect of RE2BaCuO5 refinement on the critical current density and trapped field of melt-textured (Gd, Y)-Ba-Cu-O bulk superconductors
AU - Nariki, S.
AU - Sakai, N.
AU - Murakami, M.
AU - Hirabayashi, I.
N1 - Funding Information:
This work was supported by the New Energy and Industrial Technology Development Organization (NEDO).
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2006/6/15
Y1 - 2006/6/15
N2 - We have investigated the superconducting properties of (Gd, Y)-Ba-Cu-O bulk superconductors fabricated from precursors of the Gd123-Y211 with small additions of Pt and CeO2 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 (Jc), 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 amount of RE211 was extremely small in the vicinity of a seed crystal, when the ultra-fine Y211 powder was employed. The trapped magnetic fields of Ag-added single-grain samples 25 and 33 mm in diameters were 1.5 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 the Gd123-Y211 with small additions of Pt and CeO2 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 (Jc), 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 amount of RE211 was extremely small in the vicinity of a seed crystal, when the ultra-fine Y211 powder was employed. The trapped magnetic fields of Ag-added single-grain samples 25 and 33 mm in diameters were 1.5 and 2.0 T at 77 K, respectively.
KW - (Gd, Y)-Ba-Cu-O
KW - Critical current density
KW - Melt-textured bulk
KW - Microstructure
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U2 - 10.1016/j.physc.2006.02.005
DO - 10.1016/j.physc.2006.02.005
M3 - Article
AN - SCOPUS:33747341050
SN - 0921-4534
VL - 439
SP - 62
EP - 66
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 2
ER -