Tuning of superconductivity of bulk MgB.sub.2./sub. by ball milling and sieving the boron precursor

0575137 - FZÚ 2024 RIV NL eng J - Článek v odborném periodiku
Shadab, M. - Jirsa, Miloš - Miryala, M.
Tuning of superconductivity of bulk MgB₂ by ball milling and sieving the boron precursor.
Materials Chemistry and Physics. Roč. 309, Nov (2023), č. článku 128348. ISSN 0254-0584. E-ISSN 1879-3312
Grant ostatní: AV ČR(CZ) StrategieAV21/3
Program: StrategieAV
Institucionální podpora: RVO:68378271
Klíčová slova: planetary ball milling * crystalline boron * sieving * Jc improvement * bulk MgB₂
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 4.6, rok: 2022
Způsob publikování: Open access

This study aims to explore the impact of sieving the crystalline boron precursor applied after its ball milling on the critical current density (Jc) of MgB2 produced by the in-situ reaction. Various analytical techniques, such as X-ray diffraction, magnetization measurements, and microstructure analysis were employed to systematically investigate the bulk polycrystalline MgB2 samples. SEM revealed that grains of ball-milled B powder had a nanoscale size. Sieving made the powder more uniform in size. The purity of the refined powder was tested using X-ray diffraction, and four different precursor combinations were evaluated. MgB2 bulk had a homogeneous, dense microstructure composed of MgB2 nanocrystals, in contrast to the bulk MgB2 prepared of as-purchased B. The latter exhibited uneven microstructure containing both crystalline and porous non-crystalline portions.
Trvalý link: https://hdl.handle.net/11104/0344995