MgB2 Süperiletken Külçe Malzemesine Altın Kaplamasının Etkileri

Asaf Tolga Ulgen

Öz


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 650oC–850oC 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 özkütlesi arttığı gözlenmiş, aynı zamanda bazı tavlama sıcaklığında kritik geçiş sıcaklığı (Tc) iyileşme göstermiştir.

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