Strong Influence of Pressure on the Magnetic Properties of MgB2 Bulk Superconductors

Year 2023, Volume 27, Issue 1, 49 - 55, 28.02.2023

Burcu SAVAŞKAN

https://doi.org/10.16984/saufenbilder.1194146

Abstract

The influence of the pressure on the magnetic and superconducting properties of polycrystalline MgB2 bulks was studied. Bulk MgB2 samples were prepared using conventional in-situ solid state reaction and hot-pressing methods. The structural and electromagnetic properties of MgB2 samples were studied by using x-ray diffraction (XRD), scanning electronic microscope (SEM), magnetic hysteresis (M-H) and magnetic levitation force (Fz, Fx) measurements. XRD measurements proved high quality of MgB2 bulks with only small traces of MgO impurity phase. The zero-field Jc value reached 240 kA/cm2 for MgB2 sample produced by hot-press while 23 kA/cm2 for MgB2 sample produced by conventional in-situ at measurement temperature of 25 K. The max. levitation force values were obtained as 11.60 N and 15.42 N for MgB2 bulk samples produced by in-situ and hot-press methods at 25 K, respectively. All these magnetic measurements result indicate that pressure acts like driving force for manufacturing highly dense and high levitation capability MgB2 bulk superconductors.

Keywords

MgB2 superconductor, magnetic levitation force, in-situ, hot-press, critical current density

References

• [1] T. Naito, T. Sasaki, H. Fujishiro, “Trapped magnetic field and vortex pinning properties of MgB2 superconducting bulk fabricated by a capsule method,” Superconductor Science and Technology, vol. 25, no. 9, pp. 095012, 2012.
• [2] B. Savaskan, S. B. Guner, A. Yamamoto, K. Ozturk, “Trapped magnetic field and levitation force properties of multi-seeded YBCO superconductors with different seed distance.” Journal of Alloys and Compounds, vol. 829, pp. 154400, 2020.
• [3] B. Savaşkan, “Effect of the sintering temperature on electromagnetic behaviour of MgB2 bulks using experimental and numerical methods,” Journal of Superconductivity and Novel Magnetism, vol. 35, pp. 2737–2748, 2022.
• [4] M. Prakasam, F. Balima, J. Noudem, A. Largeteau, “Dense MgB2 Ceramics by Ultrahigh Pressure Field-Assisted Sintering,” Ceramics, vol. 3 (4), pp. 521-532, 2020.
• [5] G. A. B. Matthews, T. Mousavi, S. Santra, C. R. M. Grovenor, P. S. Grant, S. C. Speller, “Improving the connectivity of MgB2 bulk superconductors by a novel liquid phase sintering process,” Superconductor Science and Technology, vol. 75, no. 6, pp 065005, 2022.
• [6] G. Giunchi, G. Ripamonti, T. Cavallin, E. Bassani, “The reactive liquid Mg infiltration process to produce large superconducting bulk MgB2 manufacts,” Cryogenics, vol. 46, pp. 237–242, 2006.
• [7] J. G. Noudem, P. Bernstein, L. Dupont, F. G. R. Martin, G. G. Sotelo, D. H. N. Dias, R. de Andrade, M. Muralidhar, M. Murakami, “Spark Plasma Sintering of bulk MgB2 and levitation force measurements,” Superconductor Science and Technology, vol. 33, no. 2, pp. 024001, 2020.
• [8] B. Savaskan, M. Abdioglu, K. Ozturk, “Determination of magnetic levitation force properties of bulk MgB2 for different permanent magnetic guideways in different cooling heights,” Journal of Alloys and Compounds, vol. 834, pp. 155167, 2020.
• [9] H. Fujishiro, H. Mochizuki, T. Naito, M. D. Ainslie, G. Giunchi, “Flux jumps in high-Jc MgB2 bulks during pulsed field magnetization,” Superconductor Science and Technology, vol. 29, no. 3, pp. 034006, 2016.
• [10] A. Bhagurkar, “Processing of MgB2 Bulk Superconductor by Infiltration and Growth,” Ph.D. dissertation, Brunel University, London, England, 2017.
• [11] S. B. Guner, B. Savaşkan, K. Ozturk, Ş. Celik, C. Aksoy, F. Karaboğa, E. T. Koparan, E. Yanmaz, “Investigation on superconducting and magnetic levitation force behaviour of excess Mg doped-bulk MgB2 superconductors,” Cryogenics, vol. 101, pp. 131-136, 2019.
• [12] S. Celik, “J. Alloys Compd., Design of magnetic levitation force measurement system at any low temperatures from 20 K to room temperature,” vol. 662, pp. 546-556, 2016.
• [13] C. P. Bean, “Magnetization of hard superconductors,” Physical Review Letters, vol. 8, pp. 250–253, 1962.
• [14] W. Lei, J. Zheng, Z. Huang, W. Zhang, Z. Deng, “Study of long-time levitation performance of high temperature superconducting maglev under vertical vibration”, Physica C, vol. 600, pp. 1354099, 2022.
• [15] G. Fuchs, W. Häßler, K., Nenkov, J. Scheiter, O. Perner, A. Handstein, T. Kanai, L. Schultz, B. Holzapfel, “High trapped fields in bulk MgB2 prepared by hot-pressing of ball-milled precursor powder,” Superconductor Science and Technology, vol. 26, no. 12, pp. 122002, 2013.
• [16] K. Ozturk, S. B. Guner, M. Abdioglu, M. Demirci, S. Celik, A. Cansiz, “An analysis on the relation between the seed distance and vertical levitation force for the multi−seeded YBCO using the modified advanced frozen image (MAFI) and experimental methods”, Journal of Alloys and Compounds, vol. 805, pp. 1208-1216, 2019.
• [17] M. Murakami, T. Oyama, H. Fujimoto, S. Gotoh, K. Yamaguchi, Y. Shiohara, “Melt processing of bulk high Tc superconductors and their application,” IEEE Transactions on Magnetics, vol. 27, no. 2, pp. 1479–1486, 1991.