铝酸镧单晶基底上沉积BaPbO_3导电膜的研究

On the BaPbO3 Conductive Film Deposited on Monocrystalline LaAlO_3 Substrate

为了使BaPbO3薄膜作为YBCO涂层导体的导电隔离层,必须制备出具有一定取向且表面平整光滑的薄膜.实验采用乙酸钡和乙酸铅为溶质,以丙酸为溶剂,制得了稳定均匀的涂层前驱液.前驱液在单晶LaAlO3(100)基底上旋转涂覆形成的前驱膜在氧气的环境下于650℃烧结30 min制备出薄膜样品.经XRD分析,薄膜物相组成为单相的BaPbO3,且具有少许(100)取向;通过SEM观察,其表面均匀致密,厚度约为650nm;用四引线法测得薄膜室温电阻率为1×10-3Ω.cm.

The flat and smooth BaPbO3 thin film with a certain crystal orientation was prepared as a conductively isolated layer for YBCO coated conductors. In the experiment, a stably homogeneous precursor solution was obtained taking the barium acetate and lead acetate as solutes with propionic acid as solvent. Then, the precursor film was deposited on the monocrystalline LaAlO3（100） substrate by spin-coating the solution, and a BaPbO3 thin film was prepared by sintering the precursor film at 650 ℃ for 30 min in oxygen atmosphere. The XRD patterns showed that the film is of single-phase BaPbO3 with a slight （100） orientation, and the SEM images revealed that the film is about 650 nm thick with a compact and homogeneous surface. The thin film resistance was measured by four-probe method at room temperature and the resistivity is about 1×10^-3 Ω·cm.