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

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationSuperconductivity and Particle Accelerators 2018
EditorsRyszard S. Romaniuk, Dariusz Bocian
PublisherSPIE
ISBN (Electronic)9781510627833
DOIs
Publication statusPublished - 2019
Event4th Conference on Superconductivity and Particle Accelerators, SPAS 2018 - Krakow, Poland
Duration: 2018 Nov 272018 Nov 29

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11054
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference4th Conference on Superconductivity and Particle Accelerators, SPAS 2018
Country/TerritoryPoland
CityKrakow
Period18/11/2718/11/29

Keywords

  • Critical current density
  • MgB bulk
  • Scanning electron microscopy
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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