High critical current density in Y-Ba-Cu-O bulk superconductors with very fine Y211 particles

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

doi:10.1088/0953-2048/17/2/057

High critical current density in Y-Ba-Cu-O bulk superconductors with very fine Y211 particles

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

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

70 Citations (Scopus)

Abstract

We have succeeded in enhancing the critical current density (J_c) of melt-textured Y-Ba-Cu-O superconductors by employing ultra-fine Y211 powder as precursor. The Y211 starting powders were reduced down to 110 nm in diameter with ball-milling. Single-grain Y-Ba-Cu-O samples up to 33 mm in diameter were fabricated from the precursors containing finely milled Y211 powders. The Y211 inclusions in the melt-textured samples could be refined by decreasing the particle size of the Y211 starting powders. The maximum value of J_c at 77 K was 1.1 × 10⁵ A cm^-2 in a self-field. However, the size reduction of Y211 led to an inhomogeneous distribution of Y211 particles, in which the volume fraction of the Y211 phase greatly decreased near a seed crystal. An Ag-added bulk sample 33 mm in diameter exhibited a high trapped magnetic field of 1.6 T at 77 K.

Original language	English
Pages (from-to)	S30-S35
Journal	Superconductor Science and Technology
Volume	17
Issue number	2
DOIs	https://doi.org/10.1088/0953-2048/17/2/057
Publication status	Published - 2004 Feb 1

ASJC Scopus subject areas

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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abstract = "We have succeeded in enhancing the critical current density (Jc) of melt-textured Y-Ba-Cu-O superconductors by employing ultra-fine Y211 powder as precursor. The Y211 starting powders were reduced down to 110 nm in diameter with ball-milling. Single-grain Y-Ba-Cu-O samples up to 33 mm in diameter were fabricated from the precursors containing finely milled Y211 powders. The Y211 inclusions in the melt-textured samples could be refined by decreasing the particle size of the Y211 starting powders. The maximum value of Jc at 77 K was 1.1 × 105 A cm-2 in a self-field. However, the size reduction of Y211 led to an inhomogeneous distribution of Y211 particles, in which the volume fraction of the Y211 phase greatly decreased near a seed crystal. An Ag-added bulk sample 33 mm in diameter exhibited a high trapped magnetic field of 1.6 T at 77 K.",

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AU - Hirabayashi, I.

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High critical current density in Y-Ba-Cu-O bulk superconductors with very fine Y211 particles

Abstract

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