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High transport Jc performance by enhancing grain coupling in (Ba,K)Fe2As2 multi-filamentary wires

(Ba,K)Fe2As2铁基超导多芯线材的晶间耦合强化与性 能提高

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Abstract

Iron-based superconductors (IBSs) show great promise as materials for high-field magnets. Developing multi-filamentary wires with a large critical current density (Jc) and high mechanical strength is essential for high-field applications. In this work, multi-filamentary Cu/Ag composite sheathed (Ba,K)Fe2As2 (Ba-122) wires with various diameters were prepared using an ex-situ powder-in-tube (PIT) method and heat-treated by a hot isostatic pressing (HIP) process. Notably, the transport Jc of these wires, prepared by groove rolling, generally increases as the diameter decreases from 2.0 to 1.0 mm and reaches a maximum Jc of 3.3 × 104 A cm−2 (4.2 K, 10 T) in wires with a diameter of 1.0 mm. Additionally, the n-value of the transport Jc was greatly increased in the 1.0-mm-diameter wire. We systematically investigated the relationship between these improved transport properties and the evolution ofmass density, grain alignment, and element distribution in Ba-122 filaments of wires with different diameters. Our work proves that higher mass density and improved grain texture through the groove rolling process are beneficial for improving the transport Jc. Furthermore, our results show the possibility of cost-effective and scalable applications of (Ba,K)Fe2As2 multi-filamentary wires, which, due to their unique structure, are set to become the most promising competitors for high-field applications.

摘要

铁基超导材料在高场超导磁体领域具有很大的应用潜力, 而研 究具有高传输临界电流密度的多芯复合包套线材对于其实际应用至关 重要. 本研究基于粉末装管法, 结合孔型轧制工艺和热等静压烧结工艺 制备了多芯Cu/Ag复合包套(Ba,K)Fe2 As2 (Ba-122)超导线材. 通过对不 同直径线材中Ba-122超导芯的质量密度、晶粒取向、晶粒尺寸、元素 分布与线材的电流传输性能之间的关系进行系统研究, 我们发现线径 较小的样品中超导晶粒间的耦合得到了显著增强, 其传输临界电流密 度在`T下达到3.3 × 104 A cm−2, 同时由于晶粒尺寸和超导芯丝 的均匀性得到改善, 其电流传输的一致性(n值)也获得有效提高. 本研究 为制备高性能、高度均匀的铁基超导多芯线材提供了一种可规模化的 工艺路线, 对促进铁基超导材料的高场强电应用有重要意义.

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References

  1. Kamihara Y, Watanabe T, Hirano M, et al. Iron-based layered super-conductor La[O1−xFx]FeAs (x = 0.05–0.12) with Tc = 26 K. J Am Chem Soc, 2008, 130: 3296–3297

    Article  CAS  Google Scholar 

  2. Hsu FC, Luo JY, Yeh KW, et al. Superconductivity in the PbO-type structure α-FeSe. Proc Natl Acad Sci USA, 2008, 105: 14262–14264

    Article  CAS  Google Scholar 

  3. Putti M, Pallecchi I, Bellingeri E, et al. New Fe-based superconductors: Properties relevant for applications. Supercond Sci Technol, 2010, 23: 034003

    Article  Google Scholar 

  4. Yuan HQ, Singleton J, Balakirev FF, et al. Nearly isotropic super-conductivity in (Ba,K)Fe2As2. Nature, 2009, 457: 565–568

    Article  CAS  Google Scholar 

  5. Jaroszynski J, Hunte F, Balicas L, et al. Upper critical fields and thermally-activated transport of NdFeAsO0.7F0.3 single crystal. Phys Rev B, 2008, 78: 174523

    Article  Google Scholar 

  6. Gurevich A. Iron-based superconductors at high magnetic fields. Rep Prog Phys, 2011, 74: 124501

    Article  Google Scholar 

  7. Wang XL, Ghorbani SR, Lee SI, et al. Very strong intrinsic flux pinning and vortex avalanches in (Ba,K)Fe2As2 superconducting single crystals. Phys Rev B, 2010, 82: 024525

    Article  Google Scholar 

  8. Dimos D, Chaudhari P, Mannhart J. Superconducting transport properties of grain boundaries in YBa2Cu3O7 bicrystals. Phys Rev B, 1990, 41: 4038–4049

    Article  CAS  Google Scholar 

  9. Malagoli A, Wiesenmayer E, Marchner S, et al. Role of heat and mechanical treatments in the fabrication of superconducting Ba0.6K0.4Fe2-As2 ex situ powder-in-tube tapes. Supercond Sci Technol, 2015, 28: 095015

    Article  Google Scholar 

  10. Bonura M, Huang H, Yao C, et al. Current transport, magnetic and elemental properties of densified Ag-sheathed Ba1−xKxFe2As2 tapes. Supercond Sci Technol, 2020, 33: 095008

    Article  Google Scholar 

  11. Huang H, Yao C, Dong C, et al. High transport current superconductivity in powder-in-tube Ba0.6K0.4Fe2As2 tapes at 27 T. Supercond Sci Technol, 2018, 31: 015017

    Article  Google Scholar 

  12. Liu S, Yao C, Huang H, et al. High-performance Ba1−xKxFe2As2 superconducting tapes with grain texture engineered via a scalable fabrication Sci China Mater, 2021, 64: 2530–2540

    Article  CAS  Google Scholar 

  13. Larbalestier D, Gurevich A, Feldmann DM, et al. High-Tc superconducting materials for electric power applications Nature, 2001, 414: 368–377

    Article  CAS  Google Scholar 

  14. Pyon S, Suwa T, Tamegai T, et al. Improvements of fabrication processes and enhancement of critical current densities in (Ba,K)Fe2As2 HIP wires and tapes Supercond Sci Technol, 2018, 31: 055016

    Article  Google Scholar 

  15. Guo W, Yao C, Huang H, et al. Enhancement of transport Jc in (Ba,K)Fe2As2 HIP processed round wires. Supercond Sci Technol, 2021, 34: 094001

    Article  Google Scholar 

  16. Pyon S, Mori H, Tamegai T, et al. Fabrication of small superconducting coils using (Ba,A)Fe2As2 (A: Na, K) round wires with large critical current densities. Supercond Sci Technol, 2021, 34: 105008

    Article  Google Scholar 

  17. Weiss JD, Tarantini C, Jiang J, et al. High intergrain critical current density in fine-grain (Ba0.6K0.4)Fe2As2 wires and bulks. Nat Mater, 2012, 11: 682–685

    Article  CAS  Google Scholar 

  18. Liu S, Lin K, Yao C, et al. Transport current density at temperatures up to 25 K of Cu/Ag composite sheathed 122-type tapes and wires. percond Sci Technol, 2017, 30: 115007

    Google Scholar 

  19. Cheng Z, Dong C, Yang H, et al. Strengthened proximity effect at grain boundaries to enhance inter-grain supercurrent in Ba1−xKxFe2As2 superconductors. Mater Today Phys, 2022, 28: 100848

    Article  CAS  Google Scholar 

  20. Braccini V, Nardelli D, Penco R, et al. Development of ex situ processed MgB2 wires and their applications to magnets. Phys C-Supercond, 2007, 456: 209–217

    Article  CAS  Google Scholar 

  21. Malagoli A, Bernini C, Braccini V, et al. Fabrication and superconducting properties of multifilamentary MgB2 conductors for AC purposes: Twisted tapes and wires with very thin filaments. Supercond Sci Technol, 2009, 22: 105017

    Article  Google Scholar 

  22. Yao C, Ma Y. Recent breakthrough development in iron-based superconducting wires for practical applications. Supercond Sci Technol, 2019, 32: 023002

    Article  CAS  Google Scholar 

  23. Navarro R. Silver alloys used in composite BSCCO tapes: Development of electrical and mechanical properties during manufacture. Supercond Sci Technol, 2000, 13: R147–R170

    Article  CAS  Google Scholar 

  24. Malagoli A, Braccini V, Bernini C, et al. Study of the MgB2 grain size role in ex situ multifilamentary wires with thin filaments. Supercond Sci Technol, 2010, 23: 025032

    Article  Google Scholar 

  25. Yao C, Lin H, Zhang Q, et al. Critical current density and microstructure of iron sheathed multifilamentary Sr1−xKxFe2As2/Ag composite conductors. J Appl Phys, 2015, 118: 203909

    Article  Google Scholar 

  26. Liu S, Yao C, Huang H, et al. Enhancing transport performance in 7-filamentary Ba0.6K0.4Fe2As2 wires and tapes via hot isostatic pressing. Phys C-Supercond its Appl, 2021, 585: 1353870

    Article  CAS  Google Scholar 

  27. Morawski A, Cetner T, Gajda D, et al. MgB2 wire diameter reduction by hot isostatic pressing—A route for enhanced critical current density. Supercond Sci Technol, 2018, 31: 075008

    Article  Google Scholar 

  28. Xu HL, Feng Y, Yan G, et al. Investigation of MgB2/Fe wires with different diameters. Supercond Sci Technol, 2016, 19: 1169–1172

    Article  Google Scholar 

  29. Deryagina I, Popova E, Patrakov E. Effect of diameter of Nb3Sn-based internal-tin wires on the structure of superconducting layers. IEEE Trans Appl Supercond, 2022, 32: 1–5

    Article  Google Scholar 

  30. Cheng Z, Liu S, Dong C, et al. Effects of core density and impurities on the critical current density of CaKFe4As4 superconducting tapes. Supercond Sci Technol, 2019, 32: 105014

    Article  CAS  Google Scholar 

  31. Li W, Huang H, Guo C, et al. Significant enhancement of transport Jc in Cu/Ag-sheathed (Ba,K)Fe2As2 superconducting tapes by pre-composite technique. Sci China Mater, 2023, 66: 801–810

    Article  CAS  Google Scholar 

  32. Wang C, Gao Z, Yao C, et al. One-step method to grow Ba0.6K0.4Fe2As2 single crystals without fluxing agent Supercond Sci Technol, 2011, 24: 065002

    Google Scholar 

  33. Werthamer NR, Helfand E, Hohenberg PC Temperature and purity dependence of the superconducting critical field, Hc2. III. Electron spin and spin-orbit effects. Phys Rev, 1966, 147: 295–302

    Article  CAS  Google Scholar 

  34. Husek I, Kovac P, Pachla W. Microhardness profiles in BSCCO/Ag composites made by various technological steps. Supercond Sci Technol, 1995, 8: 617–625

    Article  CAS  Google Scholar 

Download references

Acknowledgements

This work was partially supported by the National Key R&D Program of China (2018YFA0704200), the National Natural Science Foundation of China (51977204, 52107031, and 51721005), the Strategic Priority Research Program of Chinese Academy of Sciences (XDB25000000), and the International Partnership Program of Chinese Academy of Sciences (182111KYSB20160014). The authors thank Prof. Fang Liu and Prof. Huajun Liu in Hefei for Ic–B measurement.

Author information

Authors and Affiliations

  1. Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, 100190, China

    Wenwen Guo  (郭文文), Chao Yao  (姚超), Hao Xiong  (熊颢), Peng Yang  (杨鹏), Chang Tu  (涂畅) & Yanwei Ma  (马衍伟)

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Wenwen Guo  (郭文文), Chao Yao  (姚超), Hao Xiong  (熊颢), Peng Yang  (杨鹏), Chang Tu  (涂畅) & Yanwei Ma  (马衍伟)

  3. Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology, Qilu Zhongke, Jinan, 250013, China

    Chao Yao  (姚超) & Yanwei Ma  (马衍伟)

  4. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China

    Yanwei Ma  (马衍伟)

Authors
  1. Wenwen Guo  (郭文文)
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  2. Chao Yao  (姚超)
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  3. Hao Xiong  (熊颢)
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  4. Peng Yang  (杨鹏)
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  5. Chang Tu  (涂畅)
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  6. Yanwei Ma  (马衍伟)
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Contributions

Author contributions Guo W designed the experimental plan and performed the sample preparation and most of the characterization. Yao C provided important guidance for data analysis. Xiong H assisted in sample preparation. Yang P and Tu C helped to measure the transport critical current. Ma Y directed the project and provided significant guidance on data analysis and article writing

Corresponding authors

Correspondence to Chao Yao  (姚超) or Yanwei Ma  (马衍伟).

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Conflict of interest The authors declare that they have no conflict of interest.

Additional information

Wenwen Guo received his BSc degree from the School of Materials Science and Engineering, Zhengzhou University, and is currently a PhD candidate at the Institute of Electrical Engineering, Chinese Academy of Sciences and University of Chinese Academy of Sciences under the supervision of Prof. Yanwei Ma. Guo’s research work focuses on practical research of iron-based superconductors, with a particular focus on iron-based superconducting round wires assisted by hot isostatic pressing technique.

Chao Yao is an associate professor at the Institute of Electrical Engineering, Chinese Academy of Sciences. He received his PhD degree from the University of Chinese Academy of Sciences in 2014 and BE degree from Beijing University of Posts and Telecommunications in 2008. He is a member of Youth Innovation Promotion Association, Chinese Academy of Sciences. His research focuses on the fabrication of high-performance iron-based superconducting wires based on powder-in-tube method.

Yanwei Ma is a professor at the Institute of Electrical Engineering, Chinese Academy of Sciences. He received his PhD degree from Tsinghua University in 1996, followed by postdoc and research associate positions at the University of Science and Technology Beijing, Institute for Materials Research of Tohoku University (Sendai, Japan), National Institute for Materials Science (Tsukuba, Japan), and Université de Rennes 1 (France). His research focuses on practical superconducting materials, energy storage materials and graphene-based supercapacitors.

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Guo, W., Yao, C., Xiong, H. et al. High transport Jc performance by enhancing grain coupling in (Ba,K)Fe2As2 multi-filamentary wires. Sci. China Mater. 67, 301–310 (2024). https://doi.org/10.1007/s40843-023-2683-5

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