Improved superconducting performance of Ag-added nano-diamond doped MgB2

J. Longji Dadiel, M. Muralidhar, M. Murakami

研究成果: Conference contribution

抄録

The performance improvement of disk- shaped bulk MgB2 superconductor by means of a nanoscopic diamond powder have been investigated in our previous studies, using a single-step solid-state reaction process. To further improve the critical current density (Jc), we added Ag with varied compositions of 3.5, 4.0, 4.5 wt.% in the optimized composition of 0.8 wt.% of nanodiamond added MgB2 sample and synthesized in pure Ar atmosphere. All samples were sintered at an optimized temperature of 775°C for 3 hours. X-ray diffraction patterns conformed to the main phases of MgB2 samples with additional phases observed in the Ag-added samples. Microstructures were observed with high magnification in field emission scanning electron microscope (FE-SEM) and indicated AgMg nanoparticles are embedded in the MgB2-nanodiamond matrix, which was correlated with XRD studies. Among, the 4.0 wt.% Ag doped sample exhibited the highest Jc of 389 kA/cm2 at 20 K. The present result showed that Ag addition to MgB2-nanodiamond is an effective pinning medium for bulk MgB2 and might thus be attractive for a further performance improvement of the bulk MgB2 material.

本文言語English
ホスト出版物のタイトルSuperconductivity and Particle Accelerators 2018
編集者Ryszard S. Romaniuk, Dariusz Bocian
出版社SPIE
ISBN(電子版)9781510627833
DOI
出版ステータスPublished - 2019
イベント4th Conference on Superconductivity and Particle Accelerators, SPAS 2018 - Krakow, Poland
継続期間: 2018 11 272018 11 29

出版物シリーズ

名前Proceedings of SPIE - The International Society for Optical Engineering
11054
ISSN(印刷版)0277-786X
ISSN(電子版)1996-756X

Conference

Conference4th Conference on Superconductivity and Particle Accelerators, SPAS 2018
国/地域Poland
CityKrakow
Period18/11/2718/11/29

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
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学

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