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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。
BaPbO3 (BPO) has excellent conductivity and stable chemical properties. Its lattice constant a is close to that of 2aYBCO, which is expected to become the conductive isolation layer of YB-CO superconducting tape. Two kinds of chemical solution deposition (CSD) method, BaCO3, PbO as solute, EDTA-Cit as chelating agent (inorganic method) and barium acetate and lead acetate as solute and propionic acid as solvent Referred to as organic method) BPO thin film growth by spin coating and heat treatment on a single crystal YSZ (100), LAO (100) substrate. Experiments show that the heat treatment at 700 ℃ is the appropriate temperature for the formation of BPO phase. The heat preservation and slow temperature rise in the low temperature range are conducive to the formation of a continuous and uniform BPO film. The XRD analysis, using two methods to make the film are single-phase BPO. Compared with the XRD of BPO powders, the BPO thin films prepared by the latter method show significantly enhanced (100) and (200) diffraction peaks, indicating some degree of epitaxial growth on the single crystal LAO substrate but no single Crystal growth. Observed under a scanning electron microscope, the latter method of preparing the film than the previous method uniform and dense.