MgB2 süperiletken külçe malzemesine altın kaplamasının etkileri

Year 2017, Volume: 19 Issue: 3, 121 - 128, 07.12.2017

Asaf Tolga Ulgen

https://doi.org/10.25092/baunfbed.363780

Cited By: 1

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

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