Tuning of grain boundaries in MgB.sub.2./sub. by boron ultra-sonication in 2-propanol - A way to low-cost high-J.sub.c./sub. bulk superconducting magnets

0572410 - FZÚ 2024 RIV NL eng J - Journal Article
Srikanth, A.S. - Santosh, M. - Jirsa, Miloš - Muralidhar, M.
Tuning of grain boundaries in MgB₂ by boron ultra-sonication in 2-propanol - A way to low-cost high-J_c bulk superconducting magnets.
Journal of Alloys and Compounds. Roč. 955, Sep (2023), č. článku 170146. ISSN 0925-8388. E-ISSN 1873-4669
Grant - others:AV ČR(CZ) StrategieAV21/3
Program: StrategieAV
Institutional support: RVO:68378271
Keywords : boron ultra-sonication * high-J_c * bulk MgB₂ magnets * grain boundaries * 2-Propanol
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 6.2, year: 2022
Method of publishing: Open access

Viscosity of solvent has been found to influence particle refinement during high-energy ultra-sonic treat-ment. 2-propanol, a solvent with viscosity ∼ 2.07 cP, was used to ultra-sonically refine boron powder. Unlike ball-milling, boron powder refined this way seem to be oxide free in nature as observed via X-ray diffraction (XRD). Field-emission scanning electron microscope (FE-SEM) showed a boron powder refinement up to nanoscale as well as morphological changes to the particles. FE-SEM of the bulk MgB2 fabricated from the ultra-sonically refined boron exhibited a principal MgB2 phase with scarce impurities of MgO. Lattice parameters ‘a’ and ‘c’ calculated from XRD patterns remained constant around 3.086 and 3.523 Å respectively, ruling out any carbon intrusion from solvent into bulks. Simultaneously all the bulks had Tc,onset around 38.5 K, with a sharp transition (ΔTc ∼ 0.5 K).
Permanent Link: https://hdl.handle.net/11104/0343247