Pinning behavior in bulk MgB2 prepared using boron powder refined via high-energy ultra-sonication

Sai Srikanth Arvapalli, Muralidhar Miryala, Milos Jirsa, Naomichi Sakai, Masato Murakami

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


We successfully refined a cheap commercial boron powder by means of high-energy ultra-sonication and utilized it in synthesis of bulk MgB2. Rietveld phase analysis of X-ray diffraction pattern revealed completely formed MgB2 with a low amount of MgO. MgB2 bulk prepared of boron ultra-sonicated in ethanol for 15 min showed self-field Jc of around 300 kA/cm2 at 20 K without any compromise in Tc (~39 K). Pinning analysis based on Dew-Hughes expression showed major pinning contribution from grain-boundary pinning (~95.5%), along with a slight contribution from point pinning (4.5%). The microstructure study detected a system of large MgB2 grains (hundreds nm large) and 10–20 nm sized particles, possibly Mg-B-O, formed at MgB2 grain boundaries.

Original languageEnglish
Pages (from-to)1297-1301
Number of pages5
JournalJournal of Superconductivity and Novel Magnetism
Issue number5
Publication statusPublished - 2021 May


  • Boron refinement
  • Bulk MgB
  • Flux pinning
  • Ultrasonication

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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