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Influence of the precursor powder composition on the microstructure and the critical current density of Bi2212 wires

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Abstract

Three Bi2212 (BiaSr1.94Ca0.89Cu2O8+x, a = 2.17, 2.12, 2.07) powders with different Bi contents were made by the spray pyrolysis technology. The wire made from Bi2.07Sr1.94Ca0.89Cu2O8+x powder had the largest processing window (Tp window) and the highest Je. It eventually held Je of 1187 A/mm2 and Jc of 5805 A/mm2 at 4.2 K/self-field sintered under 0.1 MPa O2. This Je value was 39% higher than that of wires made from the traditional powder composition of Bi2.17Sr1.94Ca0.89Cu2O8+x. The microstructure, the phase composition, and the current-carrying property of the wires were analyzed comprehensively. The key conclusion was as follows: (1) The melting temperature range (ΔT) obtained from DSC for Bi2212 powder might be an important index to evaluate its composition homogeneity. The lower ΔT meant better composition homogeneity of the powder and corresponded to a larger Tp window for the wire. (2) The crystal size and the texture of Bi2212 in the sintered wires were both influenced by that of Ag. Both larger crystal size and better texture of Ag were beneficial to increase that of Bi2212 in the sintered wire. (3) Holding high phase purity and high texture of Bi2212 phase in the wires were key factors to hold high Jc. (4) The micro-area XRD was used for the first time to obtain the phase composition, the microstructure, and the texture in Bi2212 sintered wires. It will be adopted sufficiently in the future study. The above results provided insightful information to understand both the phase evolution of the sintered wire and to improve its current-carrying property.

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We declare that all data generated or analyzed during this study are included in this published article (and its supplementary information files).

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Acknowledgements

The author sincerely acknowledges all the authors for contribution to the work in this article. We also would like to thank to eceshi (www.eceshi.com) for the TG/DSC testing.

Funding

This work was financially supported by the National natural Science foundation of China (No. 52002333), the Science and Technology Planning Project in Weiyang District of **’an (No. 202107), the National Key R&D Program of China (Grant No. 2021YFB3800201), the National natural Science foundation of China (No. 51902267, No. 51777172), the National Key R&D Program of China (No. 2017YFE0301402), the Major Science and Technology Projects of Shaanxi Province (Grant No. 2020zdzx04-04-02), and the Strategic Priority Research Program of the Chinese Academy of Sciences (CAS, Grant No. XDB250020200).

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Authors and Affiliations

  1. Superconducting Materials Research Center, Northwest Institute for Nonferrous Metal Research (NIN), **’an, Shaanxi, 710016, China

    Zhenbao Li, Guoqing Liu, Gaofeng Jiao, **aoyan Xu, Qingbin Hao, Lifeng Bai, Kai Yao & Chengshan Li

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  1. Zhenbao Li
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Contributions

All authors contributed to the final output of the article. Material preparation, data collection, and analysis were mainly performed by ZL, GL helped to prepare the powder, and GJ assisted to the machining of Bi2212 wires. The first draft of the manuscript was written by ZL. All the other authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Zhenbao Li.

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Li, Z., Liu, G., Jiao, G. et al. Influence of the precursor powder composition on the microstructure and the critical current density of Bi2212 wires. J Mater Sci: Mater Electron 33, 21111–21126 (2022). https://doi.org/10.1007/s10854-022-08914-2

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