Growth orientation and superconducting properties of YBa_2Cu_3O_(7-δ) films prepared by the low-fluorine sol-gel process

作     者：雷黎 赵高扬 徐慧 赵娟娟 

作者机构：School of Materials Science and EngineeringXi'an University of Technology 

出 版 物：《Journal of Semiconductors》 (半导体学报（英文版）)

年 卷 期：2010年第31卷第8期

页      面：35-41页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：Project supported by the National Natural Science Foundation of China(No.50772088) the Doctoral Fund of Ministry of Education of China(No.20096118110002) 

主　　题：YBCO films low-fluorine process growth orientation sol-gel 

摘      要：YBa_2Cu_3O_（7-δ）（YBCO） films were deposited on（100）-oriented LaAlO_3（LAO） single crystal substrates by the dip-coating process using low-fluorine *** microstructures were characterized with the aid of X-ray diffractometry,scanning electron microscopy and high-resolution transmission electron *** superconducting properties were measured by the standard four-probe *** experiment results show that the film obtained under high enough humidity conditions exhibits better c-axis texture and superconducting properties than the film under a relatively low humidity *** on the classical nucleation and chemical reaction thermodynamics theory, the underlying crystalline and growth mechanisms of YBCO films under certain humidity conditions are explained in combination with our experimental *** is suggested that the unreacted intermediate phases such as BaF_2 and CuO aggregated in the YBCO grain boundary will cause lattice distortion in the YBCO matrix and further induce the formation of a-axis oriented YBCO grains as crystallization ***,it is believed that the relative content of water vapor within the heat-treatment atmosphere plays quite an important role in the preparation of c-axis oriented YBCO film with good superconducting properties.