MgB2 süperiletken külçe malzemesine altın kaplamasının etkileri

Abstract

Magnezyum diborür (MgB₂) süperiletken külçe malzemeleri argon atmosferinde ex-situ (hazır toz) ve in-situ (Mg+2B) katıhal reaksiyon yöntemiyle hazırlanmıştır. Ex-situ/in-situ MgB₂ süperiletken örneklerin bir yüzeyine ~50 µm altın (Au) kalın film kaplaması yapılmıştır. Bir yüzeyi Au kaplı ex-situ/in-situ MgB₂ süperiletken örnekler 650^oC–850^oC sıcaklık aralığın da 1 saat tavlanmıştır. Bu malzemelerin X-Işını Kırınım (XRD) yöntemi kullanılarak mikro yapısal değişimi ve direnç-sıcaklık ölçümleri (R-T) ile elektriksel karakteristiği incelenmiştir. Au kaplamasıyla MgB₂ malzemesinin c örgü parametresi ve özkütlesinin arttığı gözlenmiş, aynı zamanda bazı tavlama sıcaklığında kritik geçiş sıcaklığı (T_c) iyileşme göstermiştir.      

Keywords

• Ex-situ/In-situ MgB2 süperiletken külçe malzeme,Au kaplama

Effects of gold coated on MgB2 superconducting bulk samples

Abstract

Magnesium diboride (MgB₂) superconducting bulk materials were prepared by the ex-situ (commercial powder) and in-situ (Mg + 2B) solid state reaction method in argon atmosphere. One surface of the ex-situ / in-situ MgB₂ superconducting samples was coated ~50 μm gold (Au) thick film. Au-coated surface of ex-situ / in-situ MgB₂ superconducting samples was annealed at temperature range from 650^oC to 850^oC for 1 hour. The microstructural properties and electrical characteristics of these materials were investigated by X-Ray Diffraction (XRD) method and resistance-temperature measurements (R-T), respectively. It has been found that the lattice parameter c and density of MgB₂ material were increased by coating Au, also the critical transition temperature (T_c) was improved at some annealing temperatures.

Keywords

• Ex-situ/In-situ MgB2 superconducting bulk sample,Au coating

References

1. Onnes, H.K., Disappearance of the electrical resistance of mercury of helium temperature, Akad. Van Wetenschappen, 14, 113, (1911).
2. Jones, M.E. and Marsh R.E., The preparation and structure of magnesium boride, MgB2, Journal of the American Chemical Society, 76, 5, 1434, (1954).
3. Nagamatsu, J., Nakagawa, N., Muranaka, T., Zenitani, Y. and Akimitsu, J., Superconductivity at 39 K in magnesium diboride, Nature, 410, 6824, 63-64, (2001).
4. Kortus, J., Mazin, I.I., Belashchenko, K.D., Antropov, V.P. and Boyer, L.L., Superconductivity of metallic boron in MgB2. Physical Review Letters, 86, 20, (2001).
5. Vinod, K., Neson V. and Syamaprasad U., Superconductivity of MgB2 in the BCS framework with emphasis on extrinsic effects on critical temperature, Superconductor Science and Technology, 20, 10, (2007).
6. Bud'Ko, S.L., Lapertot, G., Petrovic, C., Cunningham, C. E., Anderson, N. and Canfield, P.C., Boron isotope effect in superconducting MgB2. Physical Review Letters, 86, 9, (2001).
7. Onar, K., Balci, Y. and Yakinci, M.E., Effect of grain size on the electrical and magnetic properties of MgB2 thick films deposited on the Al2O3 single crystal substrates, Journal of Materials Science: Materials in Electronics, 25, 5, 2104-2110, (2014).
8. Hossain, M.S.A., Motaman, A., Çiçek, Ö., Ağıl, H., Ertekin, E., Gencer, A. and Dou, S.X., The effects of annealing temperature on the in-field J c and surface pinning in silicone oil doped MgB2 bulks and wires. Cryogenics, 52, 12, 755-759, (2012).

9. Akdoğan, M., Yetiş, H., Gajda, D., Karaboğa, F., Ülgen, A.T., Demirtürk, E. and Belenli, İ., Effect of the initial filling density on the critical current of in-situ Fe/MgB2 wires, Journal of Alloys and Compounds, 649, 1007-1010, (2015).
10. Susner, M.A., Yang, Y., Sumption, M.D., Collings, E.W., Rindfleisch, M.A., Tomsic, M.J. and Marzik, J. V., Enhanced critical fields and superconducting properties of pre-doped B powder-type MgB2 strands. Superconductor Science and Technology, 24, 1, 012001, (2010).
11. Yakinci, M. E., Aydogdu, Y., Aksan, M. A., Balci, Y. and Altin, S., Effects of ın-situ and ex-situ heat-treatment procedures on the transport properties of the MgB2 superconducting thin films fabricated by ultrasonic spray pyrolysis (USP) system, Journal of Superconductivity and Novel Magnetism, 24, 1, 241-245, (2011).
12. Senol, M.A. and Karaboga, F., Microstructure and transport properties of compaction-modified in situ Fe/MgB2 wires. Journal of Superconductivity and Novel Magnetism, 29, 10, 2479-2485, (2016).
13. Yanmaz, E., Castillo-Berrio, C., Alkan, Ü., Ülgen, A.T., Karaboğa, F., Enis, O. and Saraçoğlu, İ., Bulk MgxB2 superconductor production by excess Mg and hot press methods and their properties, Bor Dergisi, 43-48, (2017).
14. Koparan, E.T., Savaskan, B., Guner, S.B. and Celik, S., Effects of Bi-2212 addition on the levitation force properties of bulk MgB2 superconductors. Applied Physics A, 122, 2, 46, (2016).
15. Dogruer, M., Yildirim, G., Yucel, E. and Terzioglu, C., Role of diffusion-annealing temperature on the microstructural and superconducting properties of Cu-doped MgB2 superconductors, Journal of Materials Science: Materials in Electronics, 23, 11, 1965-1970, (2012).
16. Babaoğlu, M.G., Safran, S., Çiçek, Ö., Ağıl, H., Ertekin, E., Hossain, M.S.A. and Gencer, A., Microstructural and superconducting properties of C6H6 added bulk MgB2 superconductor, Journal of Magnetism and Magnetic Materials, 324, 21, 3455-3459, (2012).
17. Mamedov, B.A. and Askerov, I.M., A new algorithm for accurate evaluation of the generalized Bloch–Gruneisen function and its applications to MgB2 superconductor. Physics Letters A, 362, 4, 324-326, (2007).
18. Ulgen, A.T. and Belenli, I., The effect of Fe diffusion on some physical and superconducting properties of MgB2, Journal of Superconductivity and Novel Magnetism, 30, 4, 1089-1095, (2017).
19. Dogruer, M., Yildirim, G. and Terzioglu, C., Effect of diffusion-annealing time on magnetoresistivity of Cu-diffused bulk MgB2 superconductors with experimental and theoretical approaches, Journal of Materials Science: Materials in Electronics, 24, 3, 958-967, (2013).
20. Ulgen, A.T. and Belenli, I., Sintering time dependence of iron diffusion in MgB2 and its effect on superconducting properties, AIP Conference Proceedings, 1815, 1, 040008, (2017).
21. Aldica, G., Burdusel, M., Popa, S., Hayasaka, Y. and Badica, P., Graphene addition to MgB2 superconductor obtained by ex-situ spark plasma sintering technique, Materials Research Bulletin, 77, 205-211, (2016).
22. Gajda, D., Morawski, A., Zaleski, A., Yamamoto, A. and Cetner, T., A defect detection method for MgB2 superconducting and iron-based Ba (Fe, Co)2As2 wires, Applied Physics Letters, 108, 15, 152601, (2016).
23. Peng, J., Liu, Y., Ma, Z., Al Hossain, M. S., Xin, Y. and Jin, J., Superior critical current density obtained in MgB2 bulks via employing carbon-coated boron and minor Cu addition, Physica C: Superconductivity and its Applications, 528, 60-64, (2016).
24. Barua, S., Al Hossain, M.S., Ma, Z., Patel, D., Mustapic, M., Somer, M. and Gajda, D., Superior critical current density obtained in MgB2 bulks through low-cost carbon-encapsulated boron powder, Scripta Materialia, 104, 37-40, (2015).
25. Akdoğan, M., Yetiş, H., Gajda, D., Karaboğa, F., Rogacki, K., Morawski, A. and Belenli, İ., Use of amorphous boron and amorphous nano boron powder mixture in fabrication of long in-situ MgB2/Fe wires, Journal of Alloys and Compounds, 702, 399-403, (2017).
26. Range, K. J. and Hafner, P., Structure refinement of AuMg3, IrMg3 and IrMg2.8, Journal of Alloys and Compounds, 191, 2, L5-L7, (1993).
27. Zalaoglu, Y., Karaboga, F., Terzioglu, C. and Yildirim, G., Improvement of mechanical performances and characteristics of bulk Bi-2212 materials exposed to Au diffusion and stabilization of durable tetragonal phase by Au, Ceramics International, 43, 9, 6836-6844, (2017).