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The paper presents fabrication and characterization of spark plasma sintered textured (001) MgB2 with a record degree of orientation of about 40 % by ultra-sonication and slip casting in high magnetic field (12 T), compared to a 16 % orientation in zero-field slip casting. Structural characterization was performed by X-ray diffraction, and electron microscopy. The analysis revealed unexpected preferred orientation also in the MgO secondary phase due to the epitaxial growth of (111) MgO on (001) MgB2. The influence of oriented microstructure on the superconducting characteristics expressed by Jc, Hirr and on the pinning properties were assessed. High anisotropy versus sample orientation in applied magnetic field, H, was observed for the critical current density, Jc, irreversibility field, Hirr, pinning activation energy, U*, extracted from relaxation measurements, and h0=H/Hirr corresponding to the maximum of the volume pinning force Fp,max. The zero-field critical current, Jc0 and Fp,max are weakly or not dependent on the direction of H, while the other indicated parameters are significantly influenced. Results enable control of superconducting parameters by further optimization of microstructure through MgB2 texturing as a novel and viable strategy for development of bulk MgB2 with enhanced properties when taking advantage of its anisotropy.

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Keyword: textured MgB2 bulk, slip casting, spark plasma sintering, critical current density, pinning force, pinning activation energy

Date published: 2021-12-07

Publisher: Elsevier BV

Journal:

• Journal of Magnesium and Alloys (ISSN: 22139567) vol. 10 issue. 8 p. 2173-2184

Funding:

• NIMS PA3030 (粉体・セラミックス 結晶・界面の階層的構造制御による機能顕在化のための研究 40)
• NIMS PA5180 (セラミックスプロセッシング - 60 )
• MCI-UEFISCDI Romania PN030101 (21 N/2019), 5PTE/2020 –BIOTEHKER, and POC 37_697 no. 28/01.09.2016 REBMAT

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4963

First published URL: https://doi.org/10.1016/j.jma.2021.10.013

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Updated at: 2024-11-16 08:30:30 +0900

Published on MDR: 2024-11-16 08:30:30 +0900