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We successfully refined a cheap commercial boron powder by means of high-energy ultra-sonication and utilized it in synthesis of bulk MgB 2 . Rietveld phase analysis of X-ray diffraction pattern revealed completely formed MgB 2  with a low amount of MgO. MgB 2  bulk prepared of boron ultra-sonicated in ethanol for 15 min showed self-field  J   c   of around 300 kA/cm 2  at 20 K without any compromise in  T   c   (~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 MgB 2  grains (hundreds nm large) and 10–20 nm sized particles, possibly Mg-B-O, formed at MgB 2  grain boundaries.

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