单畴GdBCO超导块材制备方法的改进及超导特性研究  

Fabrication method improvement and superconducting property investigation of single domain GdBCO bulk superconductors

作　　者：李国政[1] 杨万民[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：《物理学报》2011年第4期648-655,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50872079);国家高技术研究发展计划(批准号:2007AA03Z241);中央高校基本科研业务费专项资金(批准号:2010ZYGX021;GK200901017)资助的课题~~

摘　　要：通过改变液相源成分和先驱块的装配方式对顶部籽晶熔渗生长方法(TSIG)进行改进,并用新方法成功制备了单畴Gd-Ba-Cu-O(GdBCO)超导块材.对样品形貌和微观结构的研究发现,应用新方法制备的样品呈现出良好的织构度,其内俘获的Gd2BaCuO5(Gd-211)内含物分布均匀且粒度较小.超导性能的测试表明,样品具有较高的超导转变温度和自场临界电流密度,表现出较大的磁悬浮力.此外,应用新方法可以简化实验步骤,缩短制备周期,提高实验的稳定性,从而降低了实验难度,为大尺寸单畴块材的批量化制备打下了基础.Top seeded infiltration and growth method（TSIG） is improved by adopting a new liquid source and novel configuration.And single-domain Gd-Ba-Cu-O（GdBCO） bulk superconductors are successfully prepared using the improved method.Experimental observations on the morphology and the microstructure show that the samples exhibit good texture and homogeneous distribution of fine Gd2BaCuO5（Gd-211） inclusions.Superconductive measurements reveal that the sample exhibits high superconducting transition temperature,self-field critical current density,and strong levitation force.In addition,the improved method can be used to simplify the process flow,shorten the experimental cycle,and hance the stability of the process,thus reducing the experimental difficulties.The results lay a good foundation for the batch production of large single domain bulks.

关 键 词：GDBCO 熔渗生长 液相源 装配方式 

分 类 号：O511[理学—低温物理]