Effect of boron precursor ultra-sonicated in hexane medium on the critical current density of sintered bulk MgB₂

Abstract The large coherence length of MgB 2 material allows defects such as grain boundaries to act strong pinning centres. As an alternative the high-cost commercial nano precursors, we used a novel ultra-sonication technique refine cheap rough boron precursor and avoid use expensive amorphous powder. Recent low-cost proved improve critical current density, J c , . Here, discuss consequences duration in hexane medium on well superconducting properties bulks. XRD revealed small peaks corresponding unreacted Mg. First derivative susceptibility was plotted function temperature explain T c,onset Δ found grow if bulk prepared ultra-sonicated for up 30 minutes then reduced with further (60 minutes). SEM micrographs showed that powder subjected longer resulted agglomeration broken particles, forming grains. Based comparison previous results, speculate viscosity might have crucial role refinement