Microstructural and superconducting properties in single-domain Gd-Ba-Cu-O bulk superconductors with insitu formed Fe3O4 ferrimagnetic particles

Kun Xu, Keita Tsuzuki, Shogo Hara, Difan Zhou, Yufeng Zhang, Masato Murakami, Daisuke Nishio-Hamane, Mitsuru Izumi

研究成果: Article

14 引用 (Scopus)

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Introducing secondary-phase inclusions into the superconducting matrix is regarded as an effective way to enhance the flux pinning performance of high temperature superconductors. The effect of Fe-B alloy additives on the microstructure and superconducting properties of top-seeded melt growth processed GdBa2Cu3O7 - δ/Ag bulk superconductors has been investigated systematically. GdBa2Cu 3O7 - δ/Ag bulks 17mm in diameter were melt-textured for various amounts of Fe-B additives in the range of 0-1.4mol%. By means of scanning and transmission electron microscopy observations, the Fe-B alloy additives were found to decompose into ferrimagnetic Fe3O 4, embedded inside or in the vicinity of silver particles. These ferrimagnetic particles may assist in reducing the Lorentz force exerted on the vortices and enhance the flux trapping capability and critical current density of Gd-Ba-Cu-O bulks. It was also found that the refinement of Gd 2BaCuO5 and its homogeneous distribution was improved together with increase of the number of Gd2BaCuO5 particles when we increase the addition of Fe-B alloy particles. The amount added introduces a systematic change in the particle distribution dependent on both size and the numbers. The observed enhancement of the trapped flux may inherently include the magnetic interactions between the ferrimagnetic Fe 3O4 with the surrounding compounds, which has a critical effect on the nucleation process of Gd2BaCuO5 inclusions.

元の言語English
記事番号085001
ジャーナルSuperconductor Science and Technology
24
発行部数8
DOI
出版物ステータスPublished - 2011 8

ASJC Scopus subject areas

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

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