本文用不同粒度的初始MgB2粉末通过PIT技术制备出非原位单芯MgB2/Fe超导带，测量了不同磁场和温度下MgB2/Fe带的Jc值，发现它具有各向异性，分析表明其各向异性的大小受初始粉末尺寸大小的影响。我们对剥离铁包套后MgB2芯的X-ray衍射花样进行了拟合分析，定量计算了MgB2/Fe界面和MgB2芯中心处的织构度，发现两处均形成了轻微的织构取向，而且Fe/MgB2界面处的织构稍强些。试验还发现MgB2/Fe带中MgB2的结晶尺寸随初始粉末尺寸的增大而增大。最后讨论了粉末粒度大小和织构度与Jc各向异性的关联性。
In this paper, the critical current density of ex-situ MgB2/Fe sheathed mono- filamentary tapes has been measured at various magnetic fields and different temperatures. The texture and anisotropy of Jc in these tapes were presented in detail. The commercial MgB2 powder was ball-milled in order to obtain different starting powder grain sizes. It was found that the anisotropy of Jc is influenced significantly by the starting powder grain size. The crystallite size of the annealed MgB2 core is more pronounced for the sample with larger starting powder grain size . In order to understand the origin of Jc anisotropy, we have undertaken detailed X-ray refinements on the degree of texturing in the MgB2 filaments after mechanical removal of the Fe sheath. The degree of texturing of the filaments at the interface Fe/MgB2 and in the centre of the MgB2 filaments has been determined. A moderate texture has been found, being slightly better at the interface between Fe and MgB2 core. The correlation among the starting power size, texturing and the anisotropy of Jc was discussed.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%