Processing of high-performance (Gd, Y)-Ba-Cu-O bulk superconductors with fine RE211 pinning centers

Shinya Nariki; Naomichi Sakai; Masato Murakami; Izumi Hirabayashi

doi:10.1109/TASC.2005.848970

Processing of high-performance (Gd, Y)-Ba-Cu-O bulk superconductors with fine RE211 pinning centers

Shinya Nariki, Naomichi Sakai, Masato Murakami, Izumi Hirabayashi

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

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 J_c 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	https://doi.org/10.1109/TASC.2005.848970
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

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AU - Hirabayashi, Izumi

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