Enhancement of critical current density of Dy-Ba-Cu-O bulk superconductor by the refinement of Dy211 particles

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Abstract

We have studied the relationship between the particle size of Dy2BaCuO5 (Dy211) starting powder in the precursor and the particle size of Dy211 inclusions trapped in the melt-textured bulk Dy-Ba-Cu-O. The mean diameter of Dy211 particles trapped in the DyBa2Cu3Oy could be reduced with decreasing the particle size of Dy211 starting powder. The Jc was increased with reducing the size of Dy211 secondary phase. The Jc of the bulk Dy-Ba-Cu-O sample with fine Dy211 inclusions 0.6 μm in size exhibited about 70 000 A/cm2 at 77 K and self-field. Large c-axis oriented Dy-Ba-Cu-O/Ag bulk sample could also be fabricated with the top-seeded melt-growth process in air. The trapped magnetic fields of the bulks with the diameters of 32 and 48 mm reached high values of 1.4 and 1.7 T at 77 K, respectively.

Original languageEnglish
Pages (from-to)814-816
Number of pages3
JournalPhysica C: Superconductivity and its Applications
Volume357-360
Issue numberSUPPL. 2
DOIs
Publication statusPublished - 2001 Aug
Externally publishedYes

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Superconducting materials
critical current
Particle size
current density
Powders
augmentation
trapped magnetic fields
inclusions
trapped particles
Magnetic fields
Air
air

Keywords

  • Critical current density
  • Dy-Ba-Cu-O
  • Melt processing
  • Trapped magnetic field

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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title = "Enhancement of critical current density of Dy-Ba-Cu-O bulk superconductor by the refinement of Dy211 particles",
abstract = "We have studied the relationship between the particle size of Dy2BaCuO5 (Dy211) starting powder in the precursor and the particle size of Dy211 inclusions trapped in the melt-textured bulk Dy-Ba-Cu-O. The mean diameter of Dy211 particles trapped in the DyBa2Cu3Oy could be reduced with decreasing the particle size of Dy211 starting powder. The Jc was increased with reducing the size of Dy211 secondary phase. The Jc of the bulk Dy-Ba-Cu-O sample with fine Dy211 inclusions 0.6 μm in size exhibited about 70 000 A/cm2 at 77 K and self-field. Large c-axis oriented Dy-Ba-Cu-O/Ag bulk sample could also be fabricated with the top-seeded melt-growth process in air. The trapped magnetic fields of the bulks with the diameters of 32 and 48 mm reached high values of 1.4 and 1.7 T at 77 K, respectively.",
keywords = "Critical current density, Dy-Ba-Cu-O, Melt processing, Trapped magnetic field",
author = "S. Nariki and Naomichi Sakai and Masato Murakami",
year = "2001",
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journal = "Physica C: Superconductivity and its Applications",
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TY - JOUR

T1 - Enhancement of critical current density of Dy-Ba-Cu-O bulk superconductor by the refinement of Dy211 particles

AU - Nariki, S.

AU - Sakai, Naomichi

AU - Murakami, Masato

PY - 2001/8

Y1 - 2001/8

N2 - We have studied the relationship between the particle size of Dy2BaCuO5 (Dy211) starting powder in the precursor and the particle size of Dy211 inclusions trapped in the melt-textured bulk Dy-Ba-Cu-O. The mean diameter of Dy211 particles trapped in the DyBa2Cu3Oy could be reduced with decreasing the particle size of Dy211 starting powder. The Jc was increased with reducing the size of Dy211 secondary phase. The Jc of the bulk Dy-Ba-Cu-O sample with fine Dy211 inclusions 0.6 μm in size exhibited about 70 000 A/cm2 at 77 K and self-field. Large c-axis oriented Dy-Ba-Cu-O/Ag bulk sample could also be fabricated with the top-seeded melt-growth process in air. The trapped magnetic fields of the bulks with the diameters of 32 and 48 mm reached high values of 1.4 and 1.7 T at 77 K, respectively.

AB - We have studied the relationship between the particle size of Dy2BaCuO5 (Dy211) starting powder in the precursor and the particle size of Dy211 inclusions trapped in the melt-textured bulk Dy-Ba-Cu-O. The mean diameter of Dy211 particles trapped in the DyBa2Cu3Oy could be reduced with decreasing the particle size of Dy211 starting powder. The Jc was increased with reducing the size of Dy211 secondary phase. The Jc of the bulk Dy-Ba-Cu-O sample with fine Dy211 inclusions 0.6 μm in size exhibited about 70 000 A/cm2 at 77 K and self-field. Large c-axis oriented Dy-Ba-Cu-O/Ag bulk sample could also be fabricated with the top-seeded melt-growth process in air. The trapped magnetic fields of the bulks with the diameters of 32 and 48 mm reached high values of 1.4 and 1.7 T at 77 K, respectively.

KW - Critical current density

KW - Dy-Ba-Cu-O

KW - Melt processing

KW - Trapped magnetic field

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U2 - 10.1016/S0921-4534(01)00372-0

DO - 10.1016/S0921-4534(01)00372-0

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VL - 357-360

SP - 814

EP - 816

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

IS - SUPPL. 2

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