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Enhanced Magnetic Levitation and Guidance Force in MgB2 Bulks by Synthetic Engine Oil Immersion

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Abstract

We have used ‘Synthetic engine oil’ as a rich easily accessible carbon source and investigated the effect of engine oil on the microstructure, critical current density (Jc), vertical levitation force (Fz) and guidance force (Fx) properties of MgB2 superconductor. The polycrystalline disk-shaped MgB2 bulk samples have been prepared using two-step solid-state reaction process. After the first heating process, MgB2 bulk samples immersed in the engine oil for different durations (30, 120, 300 and 1440 min). XRD analysis indicated the decreasing of lattice parameters of samples and confirmed C substitution in boron sites. Vertical levitation and guidance force measurements were carried out with both Field-cooling (FC) and zero-field-cooling (ZFC) regimes at different temperatures of 20, 24 and 28 K. It was found that engine oil addition slightly increases the levitation and guidance force properties. The \(F_{z}\) values were obtained as 11.17 and 11.58 N for pure and MgB2 sample immersed for 30 min at 20 K in ZFC regime. In addition, the MgB2 sample immersed for 300 min in engine oil showed the highest \(J_{c}\) value of \(5.3\times 10^{4}\) A cm− 2 at 15 K and self-field and showed the highest guidance force value of 4.14 N at 20 K. These finding suggest that synthetic engine oil is a cost-effective and promising method to improve the levitation and guidance force performance as well as the critical current density of MgB2 bulk superconductor.

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Acknowledgments

All the authors would like to thank Prof. Dr. Ekrem Yanmaz (Karadeniz Technical University, Turkey); Assoc. Prof. Akiyasu Yamamoto (Tokyo University of Agriculture and Technology) and Prof. Dr. Ali Gencer (Ankara University, Ankara, Turkey) for his support and encouragement and Dr. Canan Aksoy for her good effort to contribute on microstructure imaging to this paper (during her visit to Department of Materials at the University of Oxford). This study was supported by the Scientific Research Coordination Unit of Karadeniz Technical University of Turkey, with project no: 13182. Magnetic levitation force measurements at low temperatures were carried out at solid-state research laboratory in Recep Tayyip Erdogan University by using the system which was designed by the project supported by the Scientific and Technological Research Council of Turkey (TUBITAK), with contract number 110T622.

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Authors and Affiliations

  1. Energy Systems Engineering, Faculty of Technology, Karadeniz Technical University, 61830, Of, Trabzon, Turkey

    Burcu Savaşkan

  2. Department of Science Education, Eregli Faculty of Education, Bulent Ecevit University, 67300, Eregli, Zonguldak, Turkey

    Ezgi Taylan Koparan

  3. Department of Physics, Faculty of Arts and Sciences, Recep Tayyip Erdogan University, 53100, Rize, Turkey

    Sait Barış Güner

  4. Department of Physics, Faculty of Sciences, Karadeniz Technical University, 61080, Trabzon, Turkey

    Kemal Öztürk

  5. Department of Energy Systems Engineering, Faculty of Engineering and Architecture, Sinop University, 57000, Sinop, Turkey

    Şükrü Çelik

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  1. Burcu Savaşkan
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Correspondence to Burcu Savaşkan.

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Savaşkan, B., Koparan, E.T., Güner, S.B. et al. Enhanced Magnetic Levitation and Guidance Force in MgB2 Bulks by Synthetic Engine Oil Immersion. J Supercond Nov Magn 32, 827–837 (2019). https://doi.org/10.1007/s10948-018-4775-8

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  • DOI: https://doi.org/10.1007/s10948-018-4775-8

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