纳米Pr6O11粉末掺杂MgB2超导电性研究  

SUPERCONDUCTING PROPERTIES OF NANO-Pr_6O_(11) DOPED MgB_2 BULK MATERIAL

作　　者：潘熙锋[1] 赵勇[1] 

机构地区：[1]磁浮技术与磁浮列车教育部重点实验室,西南交通大学超导研究开发中心,成都610031

出　　处：《低温物理学报》2008年第2期125-128,共4页Low Temperature Physical Letters

基　　金：国家自然科学基金项目(项目编号:50372052,50588201);国家重大基础研究项目(973)(项目编号:2007CB616906)资助的课题~~

摘　　要：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.Bulk samples of MgB2 doped with 0, 1, 3, using a solid-state reaction route. The lattice 5, 10wt. % Pr6O11 nano-powder were prepared constants of Pr6O11-doped MgB2 systematically increase with increasing doping level, indicating a substitution of Pr for Mg in the crystal structure, and consequently, superconducting transition temperature, To, of MgB2 is slightly suppressed. At low doping level of 1 wt. % Pr6O11, the critical current density, Jc, and the irreversibility field, Hi, are improved. However, at higher doping levels, Pr6O11-doping seems harmful for the performance of MgB2 in high magnetic fields. The Pr6O11-doping mechanism on Tc and Jc is also discussed.

关 键 词：MGB2 临界电流密度 磁通钉扎 

分 类 号：O511.4[理学—低温物理]