Flux pinning and superconducting properties of bulk MgB.sub.2./sub. with MgB.sub.4./sub. addition

0534554 - FZÚ 2021 RIV DE eng J - Článek v odborném periodiku
Miryala, M. - Arvapalli, S.S. - Diko, P. - Jirsa, Miloš - Murakami, M.
Flux pinning and superconducting properties of bulk MgB₂ with MgB₄ addition.
Advanced Engineering Materials. Roč. 22, č. 3 (2020), s. 1-7, č. článku 1900750. ISSN 1438-1656. E-ISSN 1527-2648
Institucionální podpora: RVO:68378271
Klíčová slova: flux pinning * grain refinement * improved J_c * MgB₂ * MgB₄
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.862, rok: 2020
Způsob publikování: Open access

The improved performance of bulk MgB2 material with added nanometer-sized MgB4 particles is presented. Bulk polycrystalline MgB2 samples with varying amount of MgB4x(x ¼ 0, 1, 2, 3, 4, 5, and 10 wt%) are fabricated by solid-state sintering at 775 C for 3 h in pure argon gas. Microstructural studies indicat eformation of nanometer-sized grains when MgB4 is added. Density of nano-grains is inversely proportional to the MgB4 content. The MgB2 sample with 1 wt% of MgB4 shows the best performance, with its self-field critical current density reaching 385 and 315 kAcm 2 at 15 and 20 K, respectively. Flux pinning diagrams reveal the domination of grain boundary pinning mechanism.
Trvalý link: http://hdl.handle.net/11104/0312737