Effect of the excess Mg on the microstructure and superconducting properties of in-situ MgB2 bulks
Abstract
The present study was conducted with the objective of elucidating the role of magnesium in the conventional sintering in-situ process and its effect on the superconducting and microstructure properties of MgB₂+Mg bulks. Magnesium additions (10–35 wt.%) were mixed with the in-situ (Mg+B) powder to obtain composite powders, which were then sintered at 650°C by the conventional in-situ sintering route. The structural and superconducting properties of the MgB₂ samples were investigated through the utilisation of X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrical resistivity (R-T) measurements. The X-ray diffraction results confirmed that MgB₂ was the predominant phase in all of the samples. Furthermore, the addition of Mg led to an enhancement in the superconducting properties, particularly in the 10 and 15 wt.% MgB₂-Mg samples in comparison to the unmodified MgB₂ sample. The findings of this study indicate that the optimal amount of magnesium addition for the in-situ MgB₂ samples is approximately 10 wt.%.
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J. Nagamatsu, N. Nakagawa, T. Muranaka, Y. Zenitani, J. Akimitsu, Superconductivity at 39 K in magnesium diboride, Nature. 410 (2001) 63–64.
G. A. B. Matthews, T. Mousavi, S. Santra, C. R. M. Grovenor, P. S. Grant, S. Speller, Improving the connectivity of MgB2 bulk superconductors by a novel liquid phase sintering process, Supercond. Sci. Technol., 35 (2022) 6.
Y. Xing, G. Russo, P. L. Ribani, A. Morandi, P. Bernstein, J. Rossit, S. Lemonnier, F. Delorme and J. Noudem, Very strong levitation force and stability achieved with a large MgB2 superconductor disc, Supercond. Sci. Technol. 37 (2024) 02LT01.
B. Savaskan, U.K. Ozturk, S.B. Guner, M. Abdioglu, M.V. Bahadır, S. Acar, M. Somer, A.M. Ionescu, C. Locovei, M. Enculescu, P. Badica, Bulk MgB2 superconductor for levitation applications fabricated with boron processed by different routes, Journal of Alloy and Compounds. 961 (2023) 170893.
T. Prikhna, M. Eisterer, B. Büchner, R. Kluge, V. Sokolovsky, V. E.Moshchil, A. Bodenseher, J. Filzmoser, D. Lindackers, S. S. Ponomaryov, M. V. Karpets, F. N. Werfel, U. Flögel–Delor, A. Vakaliuk, and V. B. Sverdun, Trapped Fields of Hot-Pressed MgB2 for Applications in Liquid Hydrogen, IEEE Transactions on Applied Superconductivity. 33 (2023) 5.
A. Bhagurkar, Processing of MgB2 Bulk Superconductor by Infiltration and Growth, Ph. D. dissertation, Brunel University, London, England, (2017).
G. A. B Matthews, S. Santra, R. Ma, C. R. M Grovenor, P. S. Grant and S. C. Speller, Effect of the sintering temperature on the microstructure and superconducting properties of MgB2 bulks manufactured by the field assisted sintering technique, Supercond. Sci. Technol. 33 (2020) 054003.
A. Yamamoto, H. Tanaka, J. Shimoyama, H. Ogino, K. Kishio, and T. Matsushita, Towards the Realization of Higher Connectivity in MgB2 Conductors: In-situ or Sintered Ex-situ, Japanese Journal of Applied Physics. 51 (2012) 010105.
B. Savaşkan, Strong Influence of Pressure on the Magnetic Properties of MgB2 Bulk Superconductors, Sakarya University Journal of Science. 27 (2023) 48-54.
B. Savaşkan, Effect of the Sintering Temperature on Electromagnetic Behaviour of MgB2 Bulks Using Experimental and Numerical Methods, Journal of Superconductivity and Novel Magnetism, 35 (2022) 2737–2748.
Y. Xieng, Densification of MgB2 superconducting cryomagnets: Synthesis and physical properties studies, Ph.D. dissertation, Normandie University, France (2022).
Z. Ma, Y. Liu, Q. C., Liming Yu, Significant improvement in the critical current density of MgB2 bulks in situ sintered at low temperature by excess Mg addition, Physica C. 496 (2014) 49-52.
R. Zeng, L. Lu, J. L. Wang, J. Horvat, W. X. Li, D. Q. Shi, S. X. Dou, M. Tomsic and M Rindfleisch, Significant improvement in the critical current density of in situ MgB2 by excess Mg addition, Supercond. Sci. Technol. 20 (2007) L43–L47.
R. Zeng, L. Lu, W. X. Li, J. L. Wang, D. Q. Shi, J. Horvat, S. X. Dou, M. Bhatia, M. Sumption, E. W. Collings, J. M. Yoo, M. Tomsic, and M. Rindfleisch, Excess Mg addition MgB2 /Fe wires with enhanced critical current density, Journal of Applied Physics. 103 (2008) 083911.
S. B. Güner, B. Savaşkan, K. Öztürk, Ş. Çelik, 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. 101 (2019) 131–136.
B. Savaskan, E. T. Koparan, S. B. Güner, K. Öztürk, Ş. Çelik, Enhanced Magnetic Levitation and Guidance Force in MgB2 Bulks by Synthetic Engine Oil Immersion Journal of Superconductivity and Novel Magnetism. 32 (2019) 827–837.
B. Savaskan, E. T. Koparan, S. Celik, K. Ozturk, E. Yanmaz, Investigation on the levitation force behaviour of malic acid added bulk MgB2 superconductors, Physica C. 502 (2014) 63–69.
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