Effect of Mg–Ga powder addition on the superconducting properties of MgB2 samples

✍ Scribed by O.V. Shcherbakova; Dayse I. dos Santos; S.X. Dou

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 97 KB
• Volume: 460-462
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2007.04.117

✦ Synopsis

MgB 2 bulk samples containing different proportions of Mg-Ga powder were prepared by an in situ reaction technique. The Mg-Ga powder was obtained via high energy ball milling of a Mg-10 at.% Ga composite, which was fabricated by melting of pure magnesium and gallium metals inside encapsulated stainless steel tube at 655 °C in a controlled atmosphere. The MgB 2 samples containing 0, 1, 3, 5 and 7 wt.% of MgGa addition were sintered at 650 °C for 30 min in argon atmosphere. Magnetic measurements performed at 5 K and 20 K showed improved critical current density, J c , in the low magnetic field range for samples with MgGa addition. The critical temperature, T c , for all samples with gallium additions is consistently higher when compared to the pure MgB 2 .