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Physical, magnetic and mechanical properties of Bi-2212 superconductors prepared by high pelletization pressure

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Abstract

In this work, ceramic superconductors with nominal composition Bi1.8Sr2Ca1.1Cu2.1Oy were produced by different pelletization pressures at high values varied from 1.5 GPa to 6 GPa. The effects of high pelletization pressure on the structural and magnetic properties of samples fabricated in this work were investigated by means of X-ray powder diffraction, scanning electron microscopy, dc electrical resistivity, magnetic hysteresis loop measurements and Vickers microhardness measurements. The room temperature resistivity of the samples significantly decreases when pelletization pressure is increased. M-H measurements were performed at T = 10 K and 25 K, respectively. In order to examine the JC characterization of samples, Bean’s critical model was used. It was found that sample D including pelletization pressures of 6 GPa have higher values of magnetization in all applied magnetic fields, indicating good connectivity between grains. Additionally, mechanical properties of samples are also characterized by microhardness measurements at room temperatures, indicating that microhardness values as well as Jc values in sample D enhanced due to its stronger couplings between grains compared to other samples.

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Acknowledgments

This work is supported by the BAP Research Fund of Mersin University, Mersin, Turkey, under Grant Contracts No: BAP-FBE ESMB (MEA) 2014-3 YL and BAP-TTEF MEOEB (İS) 2012-8 A. 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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Authors and Affiliations

  1. Advanced Technology Research and Application Center, Mersin University, Yenisehir, TR-33343, Mersin, Turkey

    M. Ersin Aytekin & Berdan Özkurt

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

    Berdan Özkurt

  3. Department of Automotive Engineering, Faculty of Tarsus Technology, University of Mersin, Mersin, Turkey

    İlker Sugözü

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  1. M. Ersin Aytekin
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  2. Berdan Özkurt
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  3. İlker Sugözü
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Correspondence to Berdan Özkurt.

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Ersin Aytekin, M., Özkurt, B. & Sugözü, İ. Physical, magnetic and mechanical properties of Bi-2212 superconductors prepared by high pelletization pressure. J Mater Sci: Mater Electron 26, 1799–1805 (2015). https://doi.org/10.1007/s10854-014-2613-8

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  • DOI: https://doi.org/10.1007/s10854-014-2613-8

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