采用扩散法制备高Jc的MgB2超导块材,将制各样品的超导性能与传统固相反应法制备CTNs掺杂的MgB2超导块材的性能做详细对比.研究发现,所采用的新型扩散方法可以有效地提高MgB2块材的密度,减少原料Mg粉中氧的不利影响,该法制备的MgB2块材更为均匀,MgO杂相较少,从而可以在自场下得到较高的临界电流密度,但在高场下性能提高并不明显,而CNTs掺杂可以有效改善扩散法制备的样品在高场下性能较差的弱点.CNTs掺杂量为0.5%(质量分数)的样品,在10 K,4 T条件下,Jc仍有1.0×104 A/cm2,在零场下更达到了0.46 MA/cm2,比在相同条件下用固相反应法制备的样品要高2～3倍.
参考文献
| [1] | Nagamatsu J;Nakagawa N;Muranaka T;Zenitani Y;Akimitsu J .Superconductivity at 39 K in magnesium diboride[J].Nature,2001(6824):63-64. |
| [2] | Zhao Y et al.[J].Applied Physics Letters,2002,80:1640. |
| [3] | 闫世成,闫果,卢亚锋,周廉.Mg-B体系成相热力学研究[J].稀有金属材料与工程,2006(12):1892-1895. |
| [4] | Canfield PC.;Bud'ko SL.;Ostenson JE.;Lapertot G. Cunningham CE.;Petrovic C.;Finnemore DK. .Superconductivity in dense MgB2 wires[J].Physical review letters,2001(11):2423-2426. |
| [5] | Ueda S et al.[J].Applied Physics Letters,2005,86:222502. |
| [6] | Dou S X et al.[J].Applied Physics Letters,2003,83:4996. |
| [7] | Wei J et al.[J].Chemical Physics,2003,78:785. |
| [8] | Eom C B et al.[J].Nature,411:558. |
| [9] | Serquis A et al.[J].Applied Physics Letters,2003,82:561572. |
| [10] | Zhao Y et al.[J].Journal of Applied Physics,2006,100:123902. |
| [11] | Yamamoto A;Shimoyama J;Ueda S;Katsura Y;Iwayama I;Horii S;Kishio K .Crystallinity and flux pinning properties of MgB2 bulks[J].Physica, C. Superconductivity and its applications,2006(0):806-810. |
| [12] | Soltanian S.;Horvat J.;Wang XL.;Munroe P.;Dou S. .Effect of nano-carbon particle doping on the flux pinning properties of MgB2 superconductor[J].Physica, C. Superconductivity and its applications,2003(3):185-190. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%