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A Significant Enhancement in J c Values Through Excessive Na Doping in Bi 2 Sr 2 Ca 1 Cu2−x Na x O y Superconductors

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Abstract

In this study, the effects of excessive Na substitution on the structural and physical properties of Bi2Sr2Ca1Cu2−x Na x O y samples with x = 0.3, 0.35, 0.4, and 0.5 prepared by a conventional solid-state reaction method were investigated by means of X-ray powder diffraction (XRD), scanning electron microscope (SEM), DC electrical resistivity, and magnetic hysteresis loop measurements. It is observed from SEM images that the granular nature of Bi-2212 phase improves significantly for sample containing maximum x = 0.5 Na content in this work. Bean’s critical state model is used to determine the field dependence of critical current density (J c) from the M-H curves for all samples. It is found that the sample including x = 0.5 Na content has the highest J c values due to the improved superconducting properties with its more granular microstructure.

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Acknowledgments

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; the 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 PhD. 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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  1. Department of Energy Systems Engineering, University of Mersin, 33400, Mersin, Turkey

    Berdan Özkurt

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  1. Berdan Özkurt
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Correspondence to Berdan Özkurt.

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Özkurt, B. A Significant Enhancement in J c Values Through Excessive Na Doping in Bi 2 Sr 2 Ca 1 Cu2−x Na x O y Superconductors. J Supercond Nov Magn 28, 1501–1506 (2015). https://doi.org/10.1007/s10948-014-2942-0

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  • DOI: https://doi.org/10.1007/s10948-014-2942-0

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