Evaluation of isotopic boron (11B) for the fabrication of low activation Mg11B2 superconductor for next generation fusion magnets

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dc.contributor.authorJie, Hen_AU
dc.contributor.authorLuzin, Ven_AU
dc.contributor.authorZaman, Men_AU
dc.contributor.authorAbdulsalam, AVen_AU
dc.contributor.authorChae, KHen_AU
dc.contributor.authorChoi, Hen_AU
dc.contributor.authorLevchenko, VAen_AU
dc.contributor.authorNijhius, Aen_AU
dc.contributor.authorKim, JHen_AU
dc.contributor.authorMustapić, Men_AU
dc.contributor.authorDou, SXen_AU
dc.contributor.authorYamauchi, Yen_AU
dc.contributor.authorKhan, Aen_AU
dc.contributor.authorHossain, Aen_AU
dc.date.accessioned2020-09-02T23:17:40Zen_AU
dc.date.available2020-09-02T23:17:40Zen_AU
dc.date.issued2020-04-13en_AU
dc.description.abstractIn this study, we analyze the properties of boron isotope (11B)‐rich powders from three different sources, that is, 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 characterized 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 and correction coils for the next‐generation fusion reactors. © 1999-2020 John Wiley & Sons, Inc.en_AU
dc.identifier.citationJie, H., Luzin, V., Zaman, M., Abdulsalam, A. V., Chae, K. H., Choi, H., Levchenko, V., Nijhius, A., Kim, J. H., Mustapić, M., Dou, S. X., Yamauchi, Y., Khan, A., & Hossain, M. (2020). Evaluation of isotopic boron (11B) for the fabrication of low activation Mg11B2 superconductor for next generation fusion magnets. Journal of the American Ceramic Society, 103(10), 5488-5495. doi:10.1111/jace.17156en_AU
dc.identifier.govdoc9989en_AU
dc.identifier.issn0002-7820en_AU
dc.identifier.issue10en_AU
dc.identifier.journaltitleJournal of the American Ceramic Societyen_AU
dc.identifier.pagination5488-5495en_AU
dc.identifier.urihttps://doi.org/10.1111/jace.17156en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9760en_AU
dc.identifier.volume103en_AU
dc.language.isoenen_AU
dc.publisherJohn Wiley & Sons, Inc.en_AU
dc.subjectBoron 11en_AU
dc.subjectBoron isotopesen_AU
dc.subjectMechanical propertiesen_AU
dc.subjectMass spectroscopyen_AU
dc.subjectPowdersen_AU
dc.subjectElectron microscopyen_AU
dc.subjectX-ray photoelectron spectroscopyen_AU
dc.subjectAmorphous stateen_AU
dc.subjectCrystallizationen_AU
dc.titleEvaluation of isotopic boron (11B) for the fabrication of low activation Mg11B2 superconductor for next generation fusion magnetsen_AU
dc.typeJournal Articleen_AU
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