本文采用固相反应法制备了一系列纳米Pr6O11掺杂的MgB2超导块材,掺杂量分别为0,1,3,5,10wt.%.X射线衍射结果表明:随着Pr6O11掺杂量的增加,MgB2的晶格常数也逐渐增大,也就是说Pr原子部分替代了MgB2晶格中的Mg原子.磁测量结果显示,Pr6O11的掺杂对MgB2的超导转变温度(Tc)有很小的抑制.在低含量Pr6O11掺杂(1wt.%)时,MgB2的临界电流密度(Jc)和不可逆场(Hirr)均有明显的提高,但进一步提高Pr6O11的掺杂量时,会损害MgB2在高场下的性能.文中同时也讨论了Pr6O11掺杂影响MgB2的Tc和Jc性能的机理.
参考文献
[1] | Nagamatzu J;Nakagawa N;Muranka T et al.[J].Nature,2001,410:63. |
[2] | Zhao Y;Feng Y;Cheng C H;Zhou L et al.[J].Applied Physics Letters,2001,79:1154. |
[3] | Feng Y;Zhao Y et al.[J].Journal of Applied Physics,2002,92:2614. |
[4] | Cheng C H;Zhang H;Zhao Y et al.[J].Superconductor Science and Technology,2003,16:182. |
[5] | YeohWK;KimJ H;Horvat J .[J].Superconductor Science and Technology,2006,19:596. |
[6] | [J].Applied Physics Letters,2002,81:2026. |
[7] | [J].Applied Physics Letters,2002,81:3419. |
[8] | Dou S X;Soltanian S;Zhao Y et al.[J].Superconductor Science and Technology,2005,18:710. |
[9] | Moritomo Y;Xu S .[Z]. |
[10] | Cheng CH.;Zhao Y.;Zhu XT.;Nowotny J.;Sorrell CC.;Finlayson T.;Zhang H. .Chemical doping effect on the crystal structure and superconductivity of MgB2[J].Physica, C. Superconductivity and its applications,2003(0):588-592. |
[11] | Yamamoto A;Shimoyama J;Ueda S;Katsura Y et al.[J].Applied Physics Letters,2005,86:212502. |
[12] | Gurevich A et al.[J].Superconductor Science and Technology,2004,17:278. |
[13] | 潘熙锋,杨烨,赵勇.采用扩散法制备高临界电流密度的MgB2块材研究[J].低温物理学报,2007(04):270-274. |
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%