High critical current densities in bulk MgB2 fabricated using amorphous boron

Miryala Muralidhar, Nozaki Kenta, Michael R. Koblischka, Masato Murakami

研究成果: Article査読

22 被引用数 (Scopus)


We prepared bulk MgB2 from high-purity commercial powders of Mg metal (99.9% purity) and amorphous B (99% purity) powders using a single-step solid state reaction at 775°C for varying sintering duration from 1 to 10h in pure argon atmosphere. X-ray diffraction analysis showed that all the samples were single phase MgB2. The magnetization measurements confirmed a sharp superconducting transition with Tc,onset at around 38.2-38.8K. The critical current density (Jc) values for the MgB2 samples produced at 1h sintering time is the highest one in all processed materials here. Scanning electron microscopy analyses indicated that the sintering time has a crucial influence on the grain size. As a result, the highest Jc value of 270kAcm-2 at 20K and self-field was achieved in the sample produced at 775°C for 1h. Our results clearly demonstrate that the optimization of the sintering conditions is essential to improve the bulk MgB2 performance.

ジャーナルPhysica Status Solidi (A) Applications and Materials Science
出版ステータスPublished - 2015 10月 1

ASJC Scopus subject areas

  • 電子工学および電気工学
  • 電子材料、光学材料、および磁性材料
  • 材料化学
  • 凝縮系物理学
  • 表面および界面
  • 表面、皮膜および薄膜


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