کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1820617 | 1525769 | 2007 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The microstructures and superconducting properties of MgB2 bulks prepared by a high-energy milling method The microstructures and superconducting properties of MgB2 bulks prepared by a high-energy milling method](/preview/png/1820617.png)
We succeeded in the synthesis of high-Jc MgB2 bulks via high energy ball-milling of elemental Mg and B powder at ambient temperatures. The mixed powder was ball-milled for 1–10 h and the completed reaction was achieved by subsequent annealing. The correlations among synthesis parameters, microstructures and superconducting properties in MgB2 bulks were investigated. Samples were characterized by X-ray diffraction and scanning electron microscope, and the magnetization properties were examined by a superconducting quantum interfere device magnetometer. The highest Jc, approximately 2.3 × 105 A/cm2 (15 K, 3 T), was obtained for samples milled for 5 h and sintered at 750 °C for 1 h. It is even comparable with SiC-doped MgB2 bulks made by Dou’s group, which had exhibited the strongest reported flux pinning and the highest Jc in high field to date.
Journal: Physica C: Superconductivity and its Applications - Volume 467, Issues 1–2, 1 December 2007, Pages 38–42