Size reduction of boron particles by high-power ultrasound for optimization of bulk MgB.sub.2./sub.

0539073 - FZÚ 2021 RIV GB eng J - Journal Article
Arvapalli, S.S. - Miryala, M. - Jirsa, Miloš - Murakami, M.
Size reduction of boron particles by high-power ultrasound for optimization of bulk MgB₂.
Superconductor Science and Technology. Roč. 33, č. 11 (2020), s. 1-12, č. článku 115009. ISSN 0953-2048. E-ISSN 1361-6668
Institutional support: RVO:68378271
Keywords : high energy ultra-sonication * sintering * bulk MgB2 * cheap commercial boron
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.219, year: 2020
Method of publishing: Open access

Critical current density,Jc, in superconductors is strongly connected with size of defects in thematerial. Frequently, the smaller defects, the higherJc. In this work, we tried to reduce the sizeof cheap commercial boron precursor powder using high energy ultra-sonication in ethanolmedia. The resulting powder was then utilized in synthesizing bulk MgB2via sintering at775◦C. Effect of boron powder ultra-sonication on superconducting properties of the bulkMgB2was studied and discussed. SEM of ultra-sonicated boron showed fine particles withsharp edges (high-energy surfaces), irregular shapes and clustering of fine particles occurred forlonger ultra-sonication durations.

Permanent Link: http://hdl.handle.net/11104/0316825