Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
J Microsc. 2009 Nov;236(2):100-3. doi: 10.1111/j.1365-2818.2009.03235.x.
Structural observation of layered double perovskite oxide La(2)CuSnO(6) thin films grown epitaxially on SrTiO(3) is reported by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). Particularly the transition layer at the interface was observed, and the first B site layer at the interface was found to be almost formed by the Cu atomic layer as the random structure, followed by formation of the layered structure. In addition, HAADF-STEM images indicate that the thin film is not single crystalline, but some irregular structures were observed to grow around the interface near atomic steps of the substrate of SrTiO(3). Therefore, the steps largely affect the growth process of the thin film.
采用高角环形暗场扫描透射电子显微镜（HAADF-STEM）对在 SrTiO3 上外延生长的层状双钙钛矿氧化物 La2CuSnO6 薄膜进行了结构观察。特别观察到了界面处的过渡层，并且发现界面处的第一个 B 位层几乎由 Cu 原子层组成，呈无序结构，随后形成层状结构。此外，HAADF-STEM 图像表明，薄膜不是单晶的，而是在 SrTiO3 衬底原子台阶附近的界面处观察到一些不规则结构生长。因此，台阶对薄膜的生长过程有很大的影响。
