Citation

Jie, Hyunseock and Luzin, Vladimir and Uz-Zaman, A.S. M. Mukter and Valiyaparambil Abdulsalam, Anvar and Chae, Keun Hwa and Choi, Hyung‐il and Levchenko, Vladimir and Nijhuis, Arend and Kim, Jung H. and Mustapić, Mislav and Dou, Shi Xue and Yamauchi, Yusuke and Khan, Aslam and A. Hossain, Md. Shahriar (2020) Evaluation of isotopic boron ( 11 B) for the fabrication of low activation Mg 11 B 2 superconductor for next generation fusion magnets. Journal of the American Ceramic Society, 103 (10). pp. 5488-5495. ISSN 0002-7820

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Abstract

In this study, we analyse the properties of boron isotope (11B) rich powders from three different sources, i.e, American, Cambridge, and Pavezyum, to fabricate the bulk Mg11B2 superconductors and evaluate their superconducting properties. While 11B‐rich powder is an essential precursor to fabricate Mg11B2 superconductors for fusion magnet applications, the properties of the 11B powder turned out to be critical to determine the quality of the final superconducting product. Therefore, appropriate control of processing conditions is needed to comply with the requirements of the nuclear fusion application. Analysis of the B isotope ratio by accelerator mass spectroscopy and neutron transmission revealed that all three types of powder are enriched with 11B to better than 99 at% quality. In addition, Pavezyum’s 11B shows the lowest crystallinity and smallest crystalline domain size as evidenced by the high‐resolution X‐ray diffractometer and scanning electron microscopy. The chemical states of the boron isotope investigated with near edge X‐ray absorption fine structure spectroscopy and X‐ray photoemission spectroscopy also reveals that Pavezyum boron has amorphous structure. Mg11B2 bulks and multi‐filamentary (12‐filament) wires have been manufactured, sintered at different temperatures and characterised via the transport critical current density. The wire with Pavezyum 11B shows three times higher current carrying capacity at a particular magnetic field compared to the wire using Cambridge 11B and hence, Pavezyum 11B boron has the potential for manufacturing fusion grade Mg11B2 based magnets. The results of this study demonstrated that Boron powders with higher purity, smaller grain size and lower crystallinity are critical for improving the superconducting and electronic properties of Mg11B2 samples fabricated from the powder. Thus, the low‐neutron‐activation Mg11B2 is possibly an affordable and technically viable candidate to replace NbTi superconductors in the low field poloidal field (PF) and correction coils (CC) for the next‐generation fusion reactors.

Item Type:	Article
Uncontrolled Keywords:	superconductors, boron isotope, critical current density, magnesium diboride
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800-8360 Electronics
Divisions:	Faculty of Engineering (FOE)
Depositing User:	Ms Rosnani Abd Wahab
Date Deposited:	09 Dec 2020 10:47
Last Modified:	09 Dec 2020 10:47
URII:	http://shdl.mmu.edu.my/id/eprint/7806

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