High critical current density in RE-Ba-Cu-O bulk superconductors with very fine RE2BaCuO5 particles

S. Nariki; N. Sakai; M. Murakami; I. Hirabayashi

doi:10.1016/j.physc.2004.01.078

High critical current density in RE-Ba-Cu-O bulk superconductors with very fine RE₂BaCuO₅ particles

S. Nariki, N. Sakai, M. Murakami, I. Hirabayashi

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

61 Citations (Scopus)

Abstract

We have studied the microstructure and critical current density (J _c) of Gd-Ba-Cu-O and Y-Ba-Cu-O bulk superconductors. The size of RE₂BaCuO₅ (RE211) particles trapped in REBa ₂Cu₃O_y (RE123) matrix could be refined by employing ultra-fine RE211 powder as a precursor, which led to high J _c values exceeding 1 × 10⁵ A/cm² at 77 K in self-field for Gd-Ba-Cu-O. In the case of Y-Ba-Cu-O, however, the size reduction of Y211 led to inhomogeneous distribution of Y211 particles, in that the volume fraction of Y211 phase largely decreased near a seed crystal. We also studied superconducting properties of (Gd,Y)-Ba-Cu-O bulk material fabricated from precursor of Gd123-Y211. The employment of finely-milled Y211 powders resulted in a dramatic enhancement of J_c values in this system. The maximum J_c value for (Gd,Y)-Ba-Cu-O reached 2.5×10⁵ A/cm² at 77 K.

Original language	English
Pages (from-to)	557-565
Number of pages	9
Journal	Physica C: Superconductivity and its applications
Volume	412-414
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.physc.2004.01.078
Publication status	Published - 2004 Oct

Keywords

Critical current density
Melt-textured bulk
Microstructure Gd-Ba-Cu-O
Y-Ba-Cu-O

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/j.physc.2004.01.078

Cite this

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title = "High critical current density in RE-Ba-Cu-O bulk superconductors with very fine RE2BaCuO5 particles",

abstract = "We have studied the microstructure and critical current density (J c) of Gd-Ba-Cu-O and Y-Ba-Cu-O bulk superconductors. The size of RE2BaCuO5 (RE211) particles trapped in REBa 2Cu3Oy (RE123) matrix could be refined by employing ultra-fine RE211 powder as a precursor, which led to high J c values exceeding 1 × 105 A/cm2 at 77 K in self-field for Gd-Ba-Cu-O. In the case of Y-Ba-Cu-O, however, the size reduction of Y211 led to inhomogeneous distribution of Y211 particles, in that the volume fraction of Y211 phase largely decreased near a seed crystal. We also studied superconducting properties of (Gd,Y)-Ba-Cu-O bulk material fabricated from precursor of Gd123-Y211. The employment of finely-milled Y211 powders resulted in a dramatic enhancement of Jc values in this system. The maximum Jc value for (Gd,Y)-Ba-Cu-O reached 2.5×105 A/cm2 at 77 K.",

keywords = "Critical current density, Melt-textured bulk, Microstructure Gd-Ba-Cu-O, Y-Ba-Cu-O",

author = "S. Nariki and N. Sakai and M. Murakami and I. Hirabayashi",

note = "Funding Information: This work is supported by the New Energy and Industrial Technology Development Organization (NEDO). ",

year = "2004",

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AU - Nariki, S.

AU - Sakai, N.

AU - Murakami, M.

AU - Hirabayashi, I.

N1 - Funding Information: This work is supported by the New Energy and Industrial Technology Development Organization (NEDO).

PY - 2004/10

Y1 - 2004/10

N2 - We have studied the microstructure and critical current density (J c) of Gd-Ba-Cu-O and Y-Ba-Cu-O bulk superconductors. The size of RE2BaCuO5 (RE211) particles trapped in REBa 2Cu3Oy (RE123) matrix could be refined by employing ultra-fine RE211 powder as a precursor, which led to high J c values exceeding 1 × 105 A/cm2 at 77 K in self-field for Gd-Ba-Cu-O. In the case of Y-Ba-Cu-O, however, the size reduction of Y211 led to inhomogeneous distribution of Y211 particles, in that the volume fraction of Y211 phase largely decreased near a seed crystal. We also studied superconducting properties of (Gd,Y)-Ba-Cu-O bulk material fabricated from precursor of Gd123-Y211. The employment of finely-milled Y211 powders resulted in a dramatic enhancement of Jc values in this system. The maximum Jc value for (Gd,Y)-Ba-Cu-O reached 2.5×105 A/cm2 at 77 K.

AB - We have studied the microstructure and critical current density (J c) of Gd-Ba-Cu-O and Y-Ba-Cu-O bulk superconductors. The size of RE2BaCuO5 (RE211) particles trapped in REBa 2Cu3Oy (RE123) matrix could be refined by employing ultra-fine RE211 powder as a precursor, which led to high J c values exceeding 1 × 105 A/cm2 at 77 K in self-field for Gd-Ba-Cu-O. In the case of Y-Ba-Cu-O, however, the size reduction of Y211 led to inhomogeneous distribution of Y211 particles, in that the volume fraction of Y211 phase largely decreased near a seed crystal. We also studied superconducting properties of (Gd,Y)-Ba-Cu-O bulk material fabricated from precursor of Gd123-Y211. The employment of finely-milled Y211 powders resulted in a dramatic enhancement of Jc values in this system. The maximum Jc value for (Gd,Y)-Ba-Cu-O reached 2.5×105 A/cm2 at 77 K.

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KW - Y-Ba-Cu-O

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