A bi-layer barrier design for 122-type iron-based superconducting wires and tapes

Xu, Xingchen; Wan, Fei; Sung, Zuhawn; Hasegawa, Yuta; Kikuchi, Shinjiro; Yamamoto, Akiyasu

doi:10.1016/j.cryogenics.2022.103598

Cited by 5 publications

(1 citation statement)

References 37 publications

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“…In recent years, significant progress has been made in modeling polycrystalline materials 31,32 and evaluating grain boundary characteristics 10,[19][20][21] . However, given the sensitivity of superconducting properties to microstructures and chemical compositions [33][34][35][36][37][38] , the intricate interplay through which these factors dictate the resultant characteristics remains contentious. Consequently, the establishment of process design principles to enhance transport current properties in IBS materials is of great interest.…”

Section: Introductionmentioning

confidence: 99%

Superstrength permanent magnets with iron-based superconductors by data- and researcher-driven process design

Yamamoto,

Tokuta,

Ishii

et al. 2024

NPG Asia Mater

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Iron-based high-temperature (high-Tc) superconductors have good potential to serve as materials in next-generation superstrength quasipermanent magnets owing to their distinctive topological and superconducting properties. However, their unconventional high-Tc superconductivity paradoxically associates with anisotropic pairing and short coherence lengths, causing challenges by inhibiting supercurrent transport at grain boundaries in polycrystalline materials. In this study, we employ machine learning to manipulate intricate polycrystalline microstructures through a process design that integrates researcher- and data-driven approaches via tailored software. Our approach results in a bulk Ba0.6K0.4Fe2As2 permanent magnet with a magnetic field that is 2.7 times stronger than that previously reported. Additionally, we demonstrate magnetic field stability exceeding 0.1 ppm/h for a practical 1.5 T permanent magnet, which is a vital aspect of medical magnetic resonance imaging. Nanostructural analysis reveals contrasting outcomes from data- and researcher-driven processes, showing that high-density defects and bipolarized grain boundary spacing distributions are primary contributors to the magnet’s exceptional strength and stability.

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Section: Introductionmentioning

confidence: 99%

Superstrength permanent magnets with iron-based superconductors by data- and researcher-driven process design

Yamamoto,

Tokuta,

Ishii

et al. 2024

NPG Asia Mater

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Integrating machine learning with advanced processing and characterization for polycrystalline materials: a methodology review and application to Iron-based Supercon.Ductors

Yamamoto,

Yamanaka,

Iida

et al. 2024

Science and Technology of Advanced Materials

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Enhanced mechanical strength and texture of (Ba,K)Fe₂As₂ Cu/Ag composite sheathed tapes with Nb barrier layer

Li,

Fu,

Guo

et al. 2024

Supercond. Sci. Technol.

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Iron-based superconductors with ultra-high upper critical fields and low anisotropy have attracted much attention for superconducting mechanisms and high-field applications. In practical applications, improving the mechanical strength and heat treatment temperature of superconducting tapes is of great significance for the improvement of transport current as well as stability. In this paper, (Ba, K)Fe2As2(Ba-122) superconducting tapes with Cu/Nb/Ag composite sheaths were successfully fabricated using a pre-composite process, which provides a feasible method for the fabrication of high-strength superconducting wires and tapes. It is shown that Cu/Nb/Ag composite sheathed tapes can be sintered at 880 °C, and tapes sintered at 880 °C have the highest transport properties as well as excellent superconductivity of the superconducting cores, as demonstrated by a series of characterizations. In addition, other superconducting properties of the tapes sintered at 880 °C, including grain orientation, flux pinning, upper critical field and irreversible field, were also studied. It was found that none of the three sheaths fractured after sintering and the superconducting core had a high c-axis texture and densities. The high mechanical strength of the Cu/Nb/Ag composite sheathed tape was also demonstrated by comparative tensile experiments. The results indicate that the low-cost Ba-122 tapes with Cu/Nb/Ag composite sheaths hold great promise for future practical applications.

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A bi-layer barrier design for 122-type iron-based superconducting wires and tapes

Cited by 5 publications

References 37 publications

Superstrength permanent magnets with iron-based superconductors by data- and researcher-driven process design

Superstrength permanent magnets with iron-based superconductors by data- and researcher-driven process design

Integrating machine learning with advanced processing and characterization for polycrystalline materials: a methodology review and application to Iron-based Supercon.Ductors

Enhanced mechanical strength and texture of (Ba,K)Fe₂As₂ Cu/Ag composite sheathed tapes with Nb barrier layer

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A bi-layer barrier design for 122-type iron-based superconducting wires and tapes

Cited by 5 publications

References 37 publications

Superstrength permanent magnets with iron-based superconductors by data- and researcher-driven process design

Superstrength permanent magnets with iron-based superconductors by data- and researcher-driven process design

Integrating machine learning with advanced processing and characterization for polycrystalline materials: a methodology review and application to Iron-based Supercon.Ductors

Enhanced mechanical strength and texture of (Ba,K)Fe2As2 Cu/Ag composite sheathed tapes with Nb barrier layer

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Product

Resources

About

Enhanced mechanical strength and texture of (Ba,K)Fe₂As₂ Cu/Ag composite sheathed tapes with Nb barrier layer