Bi_2O_3氧化物掺杂对单畴YBCO超导块材磁悬浮力的影响  

The effect of oxide Bi_2O_3 doping on the levitation force of single domain YBCO bulk superconductors

作　　者：王妙[1] 杨万民[1] 马俊[1] 唐艳妮[1] 张晓菊[1] 王高峰[1] 

机构地区：[1]陕西师范大学物理学与信息技术学院,西安710062

出　　处：《中国科学：物理学、力学、天文学》2012年第4期346-351,共6页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：教育部科学技术研究重大项目(编号:311033);国家自然科学基金(批准号:50872079;51167016);国家高技术研究发展计划(编号:2007AA03Z241);中央高校基本科研业务费专项资金(编号:GK200901017)资助项目

摘　　要：采用部籽晶熔渗工(TSIG)制备出了配比为Bi2O3:Y2BaCuO5=x:(1 x)的系列单畴YBCO超块材(其中x=0.1,0.3,0.5,0.7,0.9,2,单位为wt%),并且研究了不同比例的氧化物Bi2O3掺杂对样品的生长形貌、磁悬浮力及其微观结构的影响.实验结果表明了,Bi2O3粒子的掺杂在样品中生成Y2Ba4CuBiOx(YBi2411)纳米粒子从而可有效地提高样品的磁悬浮性能.当Bi2O3粒子掺杂量x从0.1wt%(质量分数,下同)增加0.7wt%时,样品的磁悬浮力从7 N增加25 N;当其掺杂量从0.7 wt%增加2 wt%时,样品的磁悬浮力从25 N降低6 N.该实验结果对于我们进一步研究氧化物掺杂对磁通扎作用的影响及提高YBCO超块材的性能有着重要的影响.In this paper, single domain YBCO superconductors, with compositions of Bi203：Y2BaCuOs=x：（l-x）, （x=0.1; 0.3; 0.5; 0.7; 0.9; 2, units： wt%）, have been successfully fabricated by the topseeding infiltration and growth process （TSIG）. The effect of the different doping amounts of Bi203 particles on the growth morphology, the magnetic levitation force properties and microstructure of single domain YBCO bulk superconductors has been investigated. The results show that the nanoscale Y2Ba4CuBiOx （YBi2411） particles which were formatted by oxide Bi203 doping can work as effective flux pinning centers to improve the properties of YBCO bulk samples. It is found that the levitation force is increasing from 7 N to 25 N with the increasing of Bi203 addition from 0.1wt% to 0.7wt%, and decreasing from 25 N to 6 N with the increasing of Bi203 addition from 0.7wt% to 2wt%. The results are very important for further study in flux pinning of oxide Bi203 doping and improvement in the properties of YBCO bulk superconductors.

关 键 词：单畴YBCO高温超导块材 顶部籽晶熔渗工艺 Bi2O3掺杂 磁悬浮力 

分 类 号：TM26[一般工业技术—材料科学与工程]