Abstract
We report a comparative study on the synthesis of MgB2 by electrothermal explosion (ETE), self-propagating high temperature synthesis (SHS), and high-temperature sintering. Advantages of these methods are demonstrated by comparing the structural and electronic properties of final MgB2 with a superconducting transition temperature of above 39 K. The structural properties of materials were studied by XRD and SEM/EDS (chemical cartography), while imaging and electronic properties were investigated by Ultra-STEM microscopy and electron energy loss spectroscopy (EELS), respectively. The results show that the synthesized bulk compounds are highly dense, with strong intergrain connections. The EEL spectra show the peaks of σ- and anti-bonding bonds, which is in good agreement with the theoretically calculated band structure, Fermi surface, and de Haas-van Alphen frequencies.
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