前驱液中添加聚乙烯吡咯烷酮对YBa_2Cu_3O_(7-δ)膜形貌和性能的影响  

Effect of polyvinylpyrrolidon (PVP) in precursor solution on the morphology and properties of YBCO films

作　　者：李英楠[1] 李凤华[1] 李成山[2] 卢亚峰[2] 樊占国[1] 

机构地区：[1]东北大学材料与冶金学院冶金资源与环境工程研究所,辽宁沈阳110004 [2]西北有色金属研究院超导材料研究所,陕西西安710016

出　　处：《功能材料》2009年第10期1663-1665,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50702012);国家科技部"十一.五"高技术发展计划(863计划)资助项目(2008AA03Z202);辽宁省博士启动基金资助项目(20071017)

摘　　要：用三氟乙酸金属有机物沉积(TFA-MOD)方法在LaAlO3(100)基底上生长YBa2Cu3O7-δ(YB-CO)超导薄膜,研究了向前驱液中添加聚乙烯吡咯烷酮(PVP)对YBCO薄膜微结构和超导性能的影响。涂膜在氧气环境中进行200～250℃热解,再经775℃氩气环境下结晶后获得YBCO超导薄膜。在相同热处理条件下,未添加PVP的前驱液制得的YBCO薄膜临界电流密度为4050A/cm2,添加PVP的前驱液制得的YBCO薄膜临界电流密度为5800A/cm2。后者表现出较少的孔洞,较强的c轴取向,较纯的双轴织构和较高的临界电流密度。因此,向前驱液中添加PVP的化学方法可以改进YBCO涂层导体的MOD制备过程。总压,氧分压和热处理温度等工艺条件将进一步优化,以提高临界电流密度。Superconductive YBa2Cu3O7-δ （YBCO） thin films were grown on LaAlO3 （100） substrates by trifluoroacetate metal organic deposition （TFA-MOD） method, and the influences by adding polyvinylpyrrolidone （PVP） into the precursor solution on the microstructures and superconducting properties of YBCO films were investigated. Coated film was calcined at 200-250℃ in a moisture-containing oxygen atmosphere, and superconducting YBCO films have been obtained by conducting a conversion heat treatment at 775℃ in a moisture-containing Ar （1000×10^-6 oxygen） atmosphere. In the same conditions, the critical current density （Jc） of YBCO film were 4500A/cm^2 （without PVP） and 5800A/cm^2 （with PVP）, respectively. The later showed less pores, stronger c-axis orientation, purer biaxial texture and higher Jc. So this chemical modification approach adding PVP into the precursor solution is a possible candidate for improving MOD-processing of YBCO coated conductor. Further optimization of processing conditions such as total pressure, oxygen partial pressure, annealing temperature, etc. is in progress to improve critical current density.

关 键 词：TFA-MOD PVP YBCO膜 取向 超导电性 

分 类 号：O511[理学—低温物理]