Physics – Condensed Matter – Superconductivity
Scientific paper
2001-04-26
Physics
Condensed Matter
Superconductivity
15 pages, 9 figures, Submitted to Physica C on 3/27/2001, Received on 4/10/2001, Revised on 4/24/2001
Scientific paper
The fabrication, characterisation, and superconductivity of MgB2 thick films grown on stainless steel substrate were studied. XRD, SEM, and magnetic measurements were carried out. It was found that the MgB2 thick films can be fast formed by heating samples to 660 oC then immediately cooling down to room temperature. XRD shows above 90% MgB2 phase and less than 10 % MgO. However, the samples sintered at 800 oC for 4 h contain both MgB4 and MgO impurities in addition to MgB2. The fast formed MgB2 films appear to have a good grain connectivity that gives a Jc of 8 x 10 4 A/cm2at 5 K and 1 T and maintained this value at 20 K in zero field.
Dou Shi Xue
Horvat Joseph
Ionescu Marius
Li Ai-Hua
Liu Hsin-Kuan
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