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首页> 外文期刊>ACS applied materials & interfaces >Layer-by-Layer Epitaxial Growth of Defect-Engineered Strontium Cobaltites
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Layer-by-Layer Epitaxial Growth of Defect-Engineered Strontium Cobaltites

机译：逐层缺陷工程锶钴酸盐的外延生长

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摘要

Control over structure and composition of (ABO(3)) perovskite oxides offers exciting opportunities since these materials possess unique, tunable properties. Perovskite oxides with cobalt B-site cations are particularly promising, as the range of the cations stable oxidation states leads to many possible structural frameworks. Here, we report growth of strontium cobalt oxide thin films by molecular beam epitaxy, and conditions necessary to stabilize different defect concentration phases. In situ X-ray scattering is used to monitor structural evolution during growth, while in situ X-ray absorption near-edge spectroscopy is used to probe oxidation state and measure changes to oxygen vacancy concentration as a function of film thickness. Experimental results are compared to kinetically limited thermodynamic predictions, in particular, solute trapping, with semiquantitative agreement. Agreement between observations of dependence of cobaltite phase on oxidation activity and deposition rate, and predictions indicates that a combined experimental/theoretical approach is key to understanding phase behavior in the strontium cobalt oxide system.
机译：控制（ABO（3））钙钛矿氧化物的结构和组成提供令人兴奋的机会，因为这些材料具有独特的可调性。随着阳离子稳定的氧化状态的范围导致许多可能的结构框架，钙钛矿氧化物尤其有前途。这里，我们通过分子束外延报告钴氧化钛薄膜的生长，以及稳定不同缺陷浓度相的条件。原位X射线散射用于监测生长期间的结构演变，而原位X射线吸收近边光谱用于探测氧化状态并根据膜厚度的函数测量变化氧空位浓度。将实验结果与动态有限的热力学预测进行比较，特别是溶质诱捕，具有半定义协议。钴矿石相对依赖性氧化活性和沉积速率之间的观察之间的一致性，并且预测表明，组合的实验/理论方法是了解钴氧化锶系统中的相行为的关键。

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