کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1874559 | 1530966 | 2014 | 4 صفحه PDF | دانلود رایگان |
The present investigation has focused on methods to improve the critical current density (Jc) of the disk-shape bulk MgB2 superconductor by optimizing sintering conditions. The samples have been synthesized using a two-step process. The samples are sintered at 775oC for 3 h in pure argon atmosphere, followed by re-sintering at 660oC for 24 to 100 hours. X-ray diffraction showed that all the samples re-sintered are single phase and homogenous. The magnetization measurements confirm a sharp superconducting transition with Tc (onset) at around 37 K. The critical current density (Jc) for MgB2 samples increases with increasing the re-sintering time at 660 oC, in that the highest Jc value of 170 kA/cm2 at 20 K was obtained in the sample re-sintered at 660 oC for 100 h.
Journal: Physics Procedia - Volume 58, 2014, Pages 102-105