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 |
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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 1 |
Keywords
- Current density
- Gadolinium compounds
- Superconducting materials
- Yttrium compounds
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering