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MgB2 with Addition of Cubic BN and Ge2C6H10O7 Obtained by Spark Plasma Sintering Technique

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Abstract

High density (94–98% of the theoretical density) MgB2 samples added with C6H10Ge2O7 and cubic BN with compositions (MgB2)1-x(Ge2C6H10O7)0.0028(cBN)x (x = 0.003, 0.005, 0.007, 0.01) and (MgB2)1-y(Ge2C6H10O7)y(cBN)0.005 (y = 0.0014, 0.0028, 0.005, 0.0075) were obtained by spark plasma sintering technique. For optimum doped samples with x = 0.005–0.007 and y = 0.0028–0.005, a weak enhancement of zero-field critical current density Jc0, irreversibility field Hirr, and volume pinning force Fp,max was determined. This behavior is very different from similar samples added with a single additive for which Hirr has a large enhancement. Consequently, it suggests the presence of opposite structural and microstructural effects induced by the additives. These effects, on the one hand, are discussed to decrease the sensitivity of MgB2 superconducting properties in the co-added samples comparative to samples added with C6H10Ge2O7, and, on the other hand, they contribute to anomalies that were found when assessing the pinning force–related parameters by the universal scaling law.

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Acknowledgements

Authors thank C. Locovei for help with XRD analysis.

Funding

This research was funded by UEFISCDI the projects PN030101 (21N/2019), POC 37_697 no 28/01.09.2016 REBMAT and European Cooperation in Science and Technology through COST Action 19108 and COST Action 16218.

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Authors and Affiliations

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

    A. M. Ionescu, G. Aldica, S. Popa, M. Enculescu, V. Sandu, I. Pasuk, M. Burdusel, M. A. Grigoroscuta, L. Miu & P. Badica

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  1. A. M. Ionescu
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  2. G. Aldica
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  3. S. Popa
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Contributions

Conception, design, and methodology of the study were contributed by Alina Marinela Ionescu, Petre Badica, and Gheorghe Aldica. Material preparation was performed by Mihai Alexandru Grigoroscuta and Mihail Burdusel. Magnetic data collection was performed by Stelian Popa. X-ray diffraction measurements and Rietveld refinements were performed by Iuliana Pasuk. SEM observations were performed by Monica Enculescu and Petre Badica. Data analysis was performed by Alina Marinela Ionescu, Viorel Sandu, Lucica Miu, Gheorghe Aldica, and Petre Badica. The first draft of the manuscript was written by Alina Marinela Ionescu, Gheorghe Aldica, and Petre Badica, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to P. Badica.

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Ionescu, A.M., Aldica, G., Popa, S. et al. MgB2 with Addition of Cubic BN and Ge2C6H10O7 Obtained by Spark Plasma Sintering Technique. J Supercond Nov Magn 35, 3467–3476 (2022). https://doi.org/10.1007/s10948-022-06350-1

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