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首页> 外文期刊>Journal of Materials Research >Microstructure Evolution Of Ca_(0.33)coo_2 Thin Films Investigated By High-angle Annular Dark-field Scanning Transmission Electron Microscopy
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Microstructure Evolution Of Ca_(0.33)coo_2 Thin Films Investigated By High-angle Annular Dark-field Scanning Transmission Electron Microscopy

机译：高角度环形暗场扫描透射电镜研究Ca_（0.33）coo_2薄膜的微观结构演变

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摘要

Microstructures of epitaxial Ca_(0.33)CoO_2 thin films, which were grown on m(1100) plane and c(0001) plane of α-Al_2O_3 by the reactive solid-phase epitaxy (R-SPE) method and the subsequent ion-exchange treatment, were investigated in detail by using selected-area electron diffraction, high-resolution transmission electron microcopy, spherical-aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (Cs-corrected HAADF-STEM), and electron energy-loss spectroscopy (EELS). Detailed electron diffraction analyses reveal that the orientation relationships between Ca_(0.33)CoO_2 thin film and substrate are [1120]_(Ca_(0.33)CoO_2)//[0001]_(Al_2O_3) and (0001)_(Ca_(0.33)CoO_2) , having an angle of about 43° with (1100)_(Al_2O_3) for the film deposited on m(1100) plane, and [1100]_(Ca_(0.33)CoO_2)//[1120]_(Al_2O_3) and (0001)_(Ca_(0.33)CoO_2)//(0001)_(Al_2O_3) for the film deposited on c(0001) plane though a Ca-Al-O amorphous layer formed between them. CoO seed layer near the interface and residual CO_3O_4 phase inside the films were observed and identified by HAADF-STEM and EELS in both samples. Such microstructural configuration indicates that the processes of film growth during R-SPE are (ⅰ) oxidation of CoO into Co_3O_4 with residual CoO layer near the interface and (ⅱ) intercalation of Na~+ layer into Co_3O_4 to achieve the layered Na_xCoO_2 film while forming Na-Al-O amorphous layer at the interface.
机译：外延Ca_（0.33）CoO_2薄膜的微观结构，通过反应固相外延（R-SPE）方法和随后的离子交换处理在α-Al_2O_3的m（1100）平面和c（0001）平面上生长通过选择区域电子衍射，高分辨率透射电子显微镜，球面像差校正的高角度环形暗场扫描透射电子显微镜（Cs校正的HAADF-STEM）和电子能量损失进行了详细研究光谱学（EELS）。详细的电子衍射分析表明，Ca_（0.33）CoO_2薄膜与衬底之间的取向关系为[1120] _（Ca_（0.33）CoO_2）// [0001] _（Al_2O_3）和（0001）_（Ca_（0.33） CoO_2）与沉积在m（1100）平面上的薄膜的（1100）_（Al_2O_3）和[1100] _（Ca_（0.33）CoO_2）// [1120] _（Al_2O_3）成约43°角通过在它们之间形成的Ca-Al-O非晶层，在c（0001）面上沉积的膜为（0001）_（（Ca_（0.33）CoO_2）//（0001）_（Al_2O_3）。在两个样品中均观察到并通过薄膜的HAADF-STEM和EELS观察并确定了薄膜界面附近的CoO种子层和残留的CO_3O_4相。这种微观结构构型表明，R-SPE过程中膜的生长过程是（ⅰ）将CoO氧化为Co_3O_4，界面附近有残留的CoO层；以及（ⅱ）将Na〜+层插入Co_3O_4以在形成时形成层状的Na_xCoO_2膜界面处的Na-Al-O非晶层。

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