【摘要】 BaPbO3(BPO)具有优良的导电性,稳定的化学性质,其晶格常数a与2aYBCO相近,有望成为YB-CO超导带材的导电隔离层。实验采用两种化学溶液沉积(CSD)法,以BaCO3、PbO为溶质,EDTA-Cit为螯合剂的方法(简称无机法)和以乙酸钡、乙酸铅为溶质,以丙酸为溶剂的方法(简称有机法)在单晶YSZ(100)、LAO(100)基底上通过旋转涂覆和热处理生长BPO薄膜。实验表明700℃的热处理是形成BPO相的适宜温度,低温段的保温和缓慢升温有利于形成连续均匀的BPO薄膜。经XRD分析,采用两种方法制取的薄膜均为单相的BPO。与BPO粉末的XRD相比,后一种方法制取的BPO薄膜在(100)和(200)衍射峰明显增强,表明其在单晶LAO基底上实现了一定程度的外延生长,但没有实现单晶生长。在扫描电子显微镜下观察,后一种方法制取的薄膜较前一方法均匀、致密。更多还原

【Abstract】 BaPbO3(BPO) has superior conductivity and chemical stability.Its lattice parameter "a" is close to 2aYBCO.It has a potential to be an ideal buffer layer for YBCO coated superconductor.Two CSD(chemical solution deposited) methods were tried.The one is using BaCO3,PbO as solutes,EDTA and citrate as chelating agents(inorganic method).The other is using barium acetate and lead acetate as solutes and propionic acid as solvent(organic method).The thin films were prepared by spin-coating and heat treatment on bases of YSZ(100) and LAO(100).The proper prepared temperature was 700℃.The low constant temperature and low heating rate were helpful to prepare continue and smooth thin film of BPO.The XRD shows the pure BPO phase was obtained by these two methods.Compared with XRD of BPO powders,the thin film deposited on LAO by the later method showed single phase BPO and a little oriented in(100) and(200) reflections.The thin films deposited by the first method didn’t show any texture in these reflections.Monocrystal was not prepared by both these two methods.The thin films deposited by later method are denser and more uniform than that by the first method observed by SEM.更多还原