Complex pulse magnetization process and mechanical properties of spark plasma sintered bulk MgB.sub.2./sub.

0546000 - FZÚ 2022 RIV CH eng J - Článek v odborném periodiku
Miryala, M. - Arvapalli, S.S. - Sakai, N. - Murakami, M. - Mochizuki, H. - Naito, T. - Fujshiro, H. - Jirsa, Miloš - Murakami, A. - Noudem, J.
Complex pulse magnetization process and mechanical properties of spark plasma sintered bulk MgB₂.
Materials Science and Engineering B-Advanced Functional Solid-State Materials. Roč. 273, Nov (2021), č. článku 115390. ISSN 0921-5107. E-ISSN 1873-4944
Institucionální podpora: RVO:68378271
Klíčová slova: MgB₂ * spark plasma sintering * pulse field magnetization * critical current density * mechanical properties
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.407, rok: 2021
Způsob publikování: Open access

High-density MgB2 bulks with superior mechanical and superconducting properties were fabricated using spark plasma sintering (SPS). The sharp superconducting transition at 37.5 K proved high quality of the superconductors. Critical current density significantly exceeded that of conventionally sintered bulks. Flux pinning diagrams indicated dominance of grain boundary pinning, with peak position at 0.2. SPS bulks showed improved mechanical properties with 8-times higher bending strength compared to dense hot isostatic pressed bulks. Trapped field was measured at 14 K and 20 K, 1 mm above the bulk’s surface, with applied pulse field up to 2 T. A local overheating together with a complex trapped field formation in the MgB2 bulks during pulse-field magnetization were studied to elucidate limitations of Pulse Field Magnetization.
Trvalý link: http://hdl.handle.net/11104/0322674