Improved superconducting performance of Ag-added nano-diamond doped MgB 2

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


The performance improvement of disk- shaped bulk MgB 2 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 (J c ), 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 MgB 2 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 MgB 2 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 MgB 2 -nanodiamond matrix, which was correlated with XRD studies. Among, the 4.0 wt.% Ag doped sample exhibited the highest J c of 389 kA/cm 2 at 20 K. The present result showed that Ag addition to MgB 2 -nanodiamond is an effective pinning medium for bulk MgB 2 and might thus be attractive for a further performance improvement of the bulk MgB 2 material.

Original languageEnglish
Title of host publicationSuperconductivity and Particle Accelerators 2018
EditorsDariusz Bocian, Ryszard S. Romaniuk
ISBN (Electronic)9781510627833
Publication statusPublished - 2019 Jan 1
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
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


Conference4th Conference on Superconductivity and Particle Accelerators, SPAS 2018


  • 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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