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Enhancement of superconducting properties of Bi-2212 ceramics by vanadium–sodium co-doping

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Abstract

Bi2Sr2−xVxCa1Cu1.75Na0.25Oy superconductors with x = 0, 0.05, 0.1 and 0.25 were prepared by the classic solid-state reaction method. The effects of vanadium substitution have been investigated by means of X-ray powder diffraction, scanning electron microscopy, dc electrical resistivity, and magnetic hysteresis loop measurements. Results show that the superconducting properties of Bi-2212 phase can be significantly improved with x = 0.05 vanadium substitution. SEM micrographs show the presence of plate-like crystals in all samples, implying the composition of 2212 phases. In addition, Jc values of the samples were calculated from the hysteresis loop measurement by using the Bean’s model showing that Jc significantly increases with x = 0.05 vanadium substitution.

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Acknowledgments

This work is supported by the BAP Research Fund of Mersin University, Mersin, Turkey, under Grant Contracts No: 2015-TP2-1155. All samples have been prepared in the MEİTAM Central Laboratory in Mersin University in Turkey. Both SEM and XRD measurements have been made in the MEİTAM Central Laboratory in Mersin University. Other measurements in this study have been made in the METU Central Laboratory in Middle East Technical University in Ankara in Turkey. On the other hand, I wish to thank M.Sc. Aynur GURBÜZ and Ph.D. M. Serkan YALÇIN in the MEİTAM Central Laboratory and Dr. Ibrahim ÇAM in the METU Central Laboratory for their experimental support and very meticulous work.

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Authors and Affiliations

  1. Advanced Technology Research and Application Center, Mersin University, Yenişehir, 33343, Mersin, Turkey

    Murat Çalış, Berdan Özkurt, M. Ersin Aytekin, Esen Gün & Uğur Öztornacı

  2. Department of Energy Systems Engineering, Faculty of Tarsus Technology, Mersin University, Mersin, Turkey

    Berdan Özkurt

  3. Department of Physics, Faculty of Arts and Sciences, Mersin University, Çiftlikköy, 33343, Mersin, Turkey

    Berdan Özkurt & M. Ebru Kır

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  1. Murat Çalış
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  2. Berdan Özkurt
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  3. M. Ersin Aytekin
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  4. Esen Gün
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  5. M. Ebru Kır
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  6. Uğur Öztornacı
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Correspondence to Berdan Özkurt.

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Çalış, M., Özkurt, B., Aytekin, M.E. et al. Enhancement of superconducting properties of Bi-2212 ceramics by vanadium–sodium co-doping. J Mater Sci: Mater Electron 27, 2670–2675 (2016). https://doi.org/10.1007/s10854-015-4075-z

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  • DOI: https://doi.org/10.1007/s10854-015-4075-z

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