Effect of RE2BaCuO5 refinement on the critical current density and trapped field of melt-textured (Gd, Y)-Ba-Cu-O bulk superconductors

S. Nariki, Naomichi Sakai, Masato Murakami, I. Hirabayashi

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25 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)62-66
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Volume439
Issue number2
DOIs
Publication statusPublished - 2006 Jun 15

Fingerprint

Powders
Superconducting materials
critical current
current density
trapped magnetic fields
inclusions
balls
seeds
Particle size
Magnetic fields
Oxygen
atmospheres
Crystals
oxygen
crystals

Keywords

  • (Gd, Y)-Ba-Cu-O
  • Critical current density
  • Melt-textured bulk
  • Microstructure

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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abstract = "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.",
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author = "S. Nariki and Naomichi Sakai and Masato Murakami and I. Hirabayashi",
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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, Naomichi

AU - Murakami, Masato

AU - Hirabayashi, I.

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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