高温超导体Bi2223中掺杂对结构和输运性质的影响  

Effect of K and Nd Substitutions on the Superconductivity of Bi2223 Superconductors

作　　者：吴会燕[1] 阮可青[1] 尹静[1] 黄胜利[1] 吕章明[1] 李蜜[1] 曹烈兆[1] 

机构地区：[1]中国科学技术大学,安徽合肥230026

出　　处：《稀有金属材料与工程》2008年第A04期45-48,共4页Rare Metal Materials and Engineering

摘　　要：用固相反应法制备了化学计量比为Bi1.8Pb0.4Sr2-xKxCa2-yNdyCu3Oz(x=0,0.02;y=0,0.02)的样品。通过X射线衍射(XRD)技术,扫描电子显微镜(SEM),电阻率,磁性和拉曼测量对样品的结构和物性做了表征。随着掺杂的不同,样品的超导转变温度Tconset从99K变化到110K。与x=y=0的样品相比,x=0.02,y=0的样品其超导电性和临界电流密度都有了明显改善。Samples of stoichiometric composition Bi1.8Pb0.4Sr2-xKxCa2-yNdyCu3Oz with x=0, 0.01, 0.02, and y = 0, 0.01, 0.02 were prepared by the solid state reaction method and characterized by the X-ray diffraction （XRD） technique, scanning electronic microscopy （SEM）, resistivity, magnetization and Raman measurements. The results show that the superconducting transition temperature Tczero of the samples varies from 99 K to 110 K for different dopings. The critical current density （Jc） of the sample single doped with K is improved if compared with the undoped.

关 键 词：Bi2223超导体 双掺 弱联接 

分 类 号：O511[理学—低温物理]