Critical current densities in Ag-added bulk MgB2

M. Muralidhar, K. Inoue, M. R. Koblischka, M. Murakami

研究成果: Article査読

8 被引用数 (Scopus)

抄録

In previous studies, we found that bulk MgB2 contained numerous voids in various shapes and sizes. With the aim of improving the critical current density as well as the mechanical performance of the disk-shaped MgB2 bulk superconductors, we added Ag and optimized the processing conditions. The samples with varied Ag content from 0, 2, 4, 6, to 10 wt% were synthesized in pure Ar atmosphere. Microstructural observation by scanning electron microscopy confirmed that metallic Ag particles are embedded in the void regions. Furthermore, atomic force microscopy indicated that silver-based MgB2 particles are of nanometer size. As a result, the critical current density (Jc) values were improved with Ag addition as compared to pure MgB2 bulk. The sample with 4 wt% Ag addition exhibited the highest Jc of 293 kA/cm2 at 20 K and self field. The respective Jc values at 10 K were 400 kA/cm2, 300 kA/cm2, and 100 kA/cm2 in self field, 1 T and 2 T. These values are the highest record values so far reported in bulk MgB2 materials.

本文言語English
ページ(範囲)36-39
ページ数4
ジャーナルPhysica C: Superconductivity and its applications
518
DOI
出版ステータスPublished - 2015 11 15

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

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