金属有机溶液法制备YBa_2Cu_3O_(7-δ)超导薄膜的厚化特性  

Influence of Thickness on Performances of YBa_2Cu_3O_(7-δ) Films Prepared by Metal Organic Solution Deposition

作　　者：芮润生 刘志勇[1,2] 白传易[1,2] 郭艳群[1,2] 金晓艳 蔡传兵[1,2] 

机构地区：[1]上海大学超导与应用技术研究中心,上海200444 [2]上海上创超导科技有限公司,上海201401

出　　处：《无机材料学报》2014年第11期1167-1172,共6页Journal of Inorganic Materials

基　　金：上海科学技术委员会(13111102300;11dz1100302);国家自然科学基金(11174193;51202141);中国科学技术973项目(2011CBA00105)~~

摘　　要：三氟乙酸–金属有机沉积法(TFA-MOD)是YBa2Cu3O7-δ(YBCO)涂层导体制备最有前景的技术路线之一。采用添加高沸点有机溶剂二乙醇胺(DEA)对TFA-MOD法进行调制改进,抑制了缺陷形成,并通过增加前驱液金属阳离子浓度提高了单次涂敷薄膜的厚度。研究表明:低温热解膜厚度和前驱液粘度与前驱液中阳离子浓度的依赖关系均呈现幂指数关系;选择合适的前驱液浓度和涂覆参数,单次涂敷获得了较厚的薄膜,厚度达到1.3μm以上,且表面平整无开裂,微观结构总体均匀,但厚膜表面出现弥散的异质相颗粒。超导临界电流密度的测量结果显示:随着超导薄膜厚度的增加,临界电流密度呈下降趋势,而超导临界电流得到显著的提高,如前驱液浓度为2.5 mol/L样品的临界电流Ic是前驱液浓度为1.0 mol/L样品的4.7倍。Trifluoroacetate metal organic deposition（TFA-MOD） is one of the most promising technology routes for fabrication of YBa2Cu3O7-δ（YBCO） coated conductors. In this paper, high-boiling point organic solvent diethanolamine（DEA） was added to modulate and to improve the properties of precursor solution by suppression the defect in the final films. And the thickness of single coated film was increased by increased concentration of the metal ions in the precursor solution. It is revealed that an exponential relationship was found between the thickness of precursor film after low-temperature decomposition and the ion concentration, as well as the viscosity of precursor solution vs the ion concentration. Optimizing the ion concentration and dip-coating parameters, smooth and crack-free YBCO films after crystallization are achieved with the thickness more than 1.3 μm. The films show homogeneous microstructures while dispersive heterogeneous particles appear in the surface of the thick films. Critical current density（Jc） measurement shows a decrease of Jc due to the increase of the thickness of YBCO films prepared by high concentration precursor solution, while critical currents（Ic） are distinctly improved. For instance, the Ic value of YBCO film prepared by 2.5 mol/L precursor solution is 4.7 times of that by 1.0 mol/L precursor solution.

关 键 词：TFA-MOD YBCO厚膜 快速制备 二乙醇胺 前驱液浓度 

分 类 号：TQ174[化学工程—陶瓷工业]