Abstract
Commercially produced magnesium diboride powder was modified by attrition milling andball milling in propan-2-ol for various durations. These powders were characterized bymeans of particle size distribution measurements using laser diffraction, impurity analysisusing x-ray diffraction, energy dispersive spectroscopy and x-ray photoelectronspectroscopy, and scanning electron microscopy, and were then used to produce magnesiumdiboride samples through pressureless heat treatment at peak temperatures up to1100 °C. X-ray diffraction, scanning electron microscopy, Vickers hardness measurements, anddensity measurements using the Archimedes method were used to characterizethe properties of the samples, and a determination of their superconductingproperties using the magnetization method was carried out. Magnesiumdiboride produced from powder milled under certain conditions had a higherJc, mag than samples produced from as-purchased powder, but the relationship between themilling duration or energy and the superconducting performance is a complex one,affected by both the particle size and the impurity content of the starting powder.
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