Optimization of Mg Precursor Concentration to Obtain High Jc in MgB2 Synthesized with Ag Addition and Carbon Encapsulated Boron

Sai Srikanth Arvapalli, Muralidhar Miryala, Masato Murakami

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


In this work, we report an optimum amount of Mg precursor required for obtaining high critical current density (Jc) of bulk MgB2 superconductor synthesized via solid state sintering. We add a slight excess of Mg precursor to balance its losses while formation of pinning phases and impurities such as Ag-Mg phases and MgO, respectively. Several amounts of Mg had been varied such as x = 1.05, 1.075, 1.1, 1.125, and 1.15 in MgxB2. To obtain the best critical current density values, we used carbon encapsulated boron (1.5% carbon) and added 4 wt% Ag. The X-ray diffraction analysis showed the presence of AgMg and AgMg3 phases and a minute amount of MgO. The SQUID measurements indicated that highest Jc of 350 kA/cm2 at 20 K and self-field in sample with x = 1.075. All results analyzed explain the improved critical current performance based on nanometer-sized Ag-Mg particles in the final product.

Original languageEnglish
Article number8000904
JournalIEEE Transactions on Applied Superconductivity
Issue number5
Publication statusPublished - 2019 Jan 1


  • Ag addition
  • critical current density (Jc)
  • MgB
  • precursor optimization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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