Gd_2Ba_4CuWO_x掺杂对单畴GdBCO超导块材性能的影响  

THE INFLUENCE OF Gd_2Ba_4CuWO_x ON THE SUPERCONDUCTING OF GdBCO SINGLE GRAINS

作　　者：唐艳妮[1] 杨万民[1] 梁伟[1] 王妙[1] 张晓菊[1] 李佳伟[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：《低温物理学报》2012年第3期210-213,共4页Low Temperature Physical Letters

基　　金：教育部科学技术研究重大项目(批准号: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(863)(批准号:2007AA03Z241);中央高校基本科研业务费专项资金(批准号:GK200901017)资助的课题~~

摘　　要：本文采用顶部籽晶熔融织构方法(TSMTG)制备出了具有不同纳米Gd2Ba4CuWOx(GdW2411)掺杂量的系列单畴GdBCO超导块材,并研究了GdW2411的掺杂量对其微观形貌以及磁悬浮力大小的影响.研究结果表明,通过添加GdW2411粒子,可以成功的在单畴GdBCO超导块材中引入纳米GdW2411磁通钉扎中心,其粒径约在50～200nm之间;随着GdW2411掺杂比例的增加,纳米粒子的密度逐渐变大,粒度也有所变大;GdBCO超导块材磁悬浮力的大小与GdW2411掺杂量密切相关,只有当GdW2411的掺杂比例达到最佳值时,样品的磁悬浮力才达到最大.这些结果对进一步提高GdBCO超导块材性能具有重要的指导意义.In this paper , we have successfully fabricated GdBCO bulk superconductors containing different ratio nano Gd2 Ba4 CuWOx （GdW2411）by top-seeded melt-textured method （TSMTG） and studied the effect of the different doping amounts of GdW2411 on the growth morphology and the magnetic levitation force properties of single do- main GdBCO bulk superconductors. The results show that by doping GdW2411 particles, the size of which between about 50nm-200nm,we can pull the nano GdW2411 flux pinning centers into single domain GdBCO; with increasing of GdW2411 doping ratio, the density of nano-particles become larger and the particle size become larger ; the magnetic levitation force is related to the GdW2411 doped closely, only when GdW2411 ratio to the best value, the magnetic levitation force of sample achieve the maximum. The results is very important for further improvement in the properties of GdBCO bulk superconductors.

关 键 词：超导块材 熔融织构 Gd2Ba4CuWOx 磁悬浮力 

分 类 号：TM26[一般工业技术—材料科学与工程]