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Title: High-quality MgB2 nanocrystals synthesized by using modified amorphous nano-boron powders: Study of defect structures and superconductivity properties
Authors: Bateni, A.Erdem, E.Häßler, W.Somer, M.
Publishers Version:
Issue Date: 2019
Published in: AIP Advances Vol. 9 (2019), No. 4
Publisher: College Park, MD : American Institute of Physics
Abstract: Nano sized magnesium diboride (MgB2) samples were synthesized using various high-quality nano-B precursor powders. The microscopic defect structures of MgB2 samples were systematically investigated using X-ray powder diffraction, Raman, resistivity measurements and electron paramagnetic resonance spectroscopy. A significant deviation in the critical temperature Tc was observed due to defects and crystal distortion. The symmetry effect of the latter is also reflected on the vibrational modes in the Raman spectra. Scanning electron microscopy analysis demonstrate uniform and ultrafine morphology for the modified MgB2. Defect center in particular Mg vacancies influence the connectivity and the conductivity properties which are crucial for the superconductivity applications.
Keywords: Boron; Defect structures; Defects; Electron spin resonance spectroscopy; Magnesium compounds; Paramagnetic resonance; Powders; Scanning electron microscopy; X ray powder diffraction; Conductivity properties; Critical temperatures; Crystal distortion; Electron paramagnetic resonance spectroscopy; Magnesium diborides; Microscopic defects; Resistivity measurement; Scanning electrons; Boron compounds
DDC: 530
License: CC BY 4.0 Unported
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Appears in Collections:Physik

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