无氟MOD方法制备GdBCO薄膜  

FABRICATION OF GdBCO FILMS BY THE FLOURITE-FREE MOD METHOD

作　　者：木丽云[1] 李果[1] 蒲明华[1] 王文涛[1] 张勇[1] C. H. Cheng 赵勇[1,2] 

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 [2]School of Materials Science and Engineering, University of New South Wales, Sydney 2052, NSW, Australia

出　　处：《低温物理学报》2009年第1期12-15,共4页Low Temperature Physical Letters

基　　金：国家自然科学基金(项目编号:50672078);国家杰出青年基金(项目编号:50588201);国家973项目(项目编号:2007CB616906);教育部长江学者创新团队计划(项目编号:IRT0751);澳大利亚研究会(项目编号:DP0559872,DP0881739)资助的课题~~

摘　　要：采用无氟金属有机物沉积方法(MOD)在单晶基底SiTrO3(100)上制备GdBa2Cu3O7-x(GdBCO)薄膜.所用的无氟MOD方法制备GdBCO薄膜具有前驱溶液稳定、薄膜致密性好以及相比于TFA-MOD方法在热处理过程中无HF气体的产生等优点.经过一系列热处理工艺后,对薄膜进行X射线衍射(XRD)分析、扫描电镜(SEM)分析以及超导性能的测试.通过熔融外延生长,得到c轴织构良好、表面平整致密、临界超导转变温度为90K的GdBCO薄膜,77K自场下的临界电流密度约为0.6MA/cm2.GdBCO fihns have been synthesized on single crystal substrates of SiTrO3 （100）by using a fluoritefree MOD method. We have recently developed a fluorine-free MOD synthesis with several important advantages including precursor solution stability, improved film density, and elimination of HF during processing. The phase composition, microstructures and the critical temperature of superconductivity （ Tc ） and the critical current density （Jc） of GdBCO films have been investigated by x-ray diffraction （XRD）, scanning electron microscopy （SEM） and four-probe method. The Jc value of the YBCO film in self-field at 77 K was determined by the application of the Bean critical state model formula using the M - H curve. The critical temperature of superconductivity （ T ） of GdBCO films was 90 K and the critical current density （Jc） reached 0.6 MA/cm^2 at 77K in the self-field .

关 键 词：无氟MOD GDBCO 熔融外延生长 薄膜物理学 

分 类 号：O484.1[理学—固体物理]