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Ex Situ Spark Plasma Sintering of Short Powder-in-Tube MgB2 Tapes with Open and Closed Ends

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Abstract

Short powder-in-tube tapes of MgB2 in the Fe sheath were fabricated by ex situ route from a commercial powder containing some free Mg and MgO impurity phases. The final heat treatment was performed by spark plasma sintering (SPS). Tapes were with open (OT) or closed (CT) endings. Closed endings were made by folding and pressing. The MgB2 core of the OT sample has shown a higher low-field critical current density, a higher maximum pinning force, a slightly higher disorder, smaller average MgB2 crystallite size, a weak contact between Fe and MgB2 core, and more macro-flux jumps. The upper and irreversibility fields were similar for OT and CT samples. In the center of the MgB2 cores, the detected impurity phase is MgO, while at the interface with Fe, MgB4 also occurs. Impurity phases found at interface, MgO and MgB4, are present in the center of the bulk SPSed samples. Reactions and pinning-force-related parameters are discussed with respect to Mg behavior influenced by condition of endings. It is inferred that the presence of free Mg in the raw MgB2 powder has an important contribution to observed differences, and its removal or control is recommended.

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Acknowledgements

The authors thank Dr. V. Mihalache for technical assistance with XRD measurements.

Funding

The authors acknowledge MCI-UEFISCDI, projects POC 37_697 no. 28/01.09.2016 REBMAT and Core Program PN09-450 (2017), Romania.

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Authors and Affiliations

  1. National Institute of Materials Physics, Atomistilor 405A, Magurele, 077125, Ilfov, Romania

    G. Aldica, M. Burdusel, S. Popa, I. Pasuk, A. M. Ionescu, A. Kuncser & P. Badica

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  1. G. Aldica
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  2. M. Burdusel
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  3. S. Popa
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  4. I. Pasuk
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  5. A. M. Ionescu
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  6. A. Kuncser
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  7. P. Badica
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Correspondence to P. Badica.

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Aldica, G., Burdusel, M., Popa, S. et al. Ex Situ Spark Plasma Sintering of Short Powder-in-Tube MgB2 Tapes with Open and Closed Ends. J Supercond Nov Magn 31, 3423–3432 (2018). https://doi.org/10.1007/s10948-018-4616-9

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  • DOI: https://doi.org/10.1007/s10948-018-4616-9

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