Superconducting properties of sintered bulk MgB.sub.2./sub. prepared from hexane-mediated high-energy-ultra-sonicated boron

0541847 - FZÚ 2022 RIV NL eng J - Journal Article
Arvapalli, S.S. - Miryala, M. - Sunsanee, P. - Jirsa, Miloš - Murakami, M.
Superconducting properties of sintered bulk MgB₂ prepared from hexane-mediated high-energy-ultra-sonicated boron.
Materials Science and Engineering B-Advanced Functional Solid-State Materials. Roč. 265, Mar (2021), č. článku 115030. ISSN 0921-5107. E-ISSN 1873-4944
Institutional support: RVO:68378271
Keywords : high-energy ultra-sonication * hexane dispersant * bulk MgB₂ * cheap commercial boron
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.407, year: 2021
Method of publishing: Limited access
https://doi.org/10.1016/j.mseb.2020.115030

Recently, novel low cost techniques have been employed to improve critical current density of MgB2. Ultra-sonication is one such technique. We report on the influence of hexane dispersant on particle size of ultra-sonicated cheap commercial boron and the superconducting properties of MgB2 bulks prepared using this new precursor. XRD showed major peaks corresponding to MgB2, with small fractions of MgO and unreacted Mg. Tc was close to 39 K, with a sharp transition. The highest Jc was found in the sample with boron ultra-sonicated for 30 min as high as 375, 328, and 270 kA/cm2 at 10, 15, and 20 K, respectively. SEM analysis revealed tiny particles and layers randomly dispersed in the microstructure, while EDX indicated that these particles were secondary phases of Mg, B, and O. Flux pinning diagrams showed the peak of normalized pinning force located close to b = 0.2, depicting dominance of grain boundary pinning mechanism.
Permanent Link: http://hdl.handle.net/11104/0319358