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首页> 外文期刊>Physical Review X >Direct Observation of Sr Vacancies in SrTiO 3 by Quantitative Scanning Transmission Electron Microscopy
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Direct Observation of Sr Vacancies in SrTiO 3 by Quantitative Scanning Transmission Electron Microscopy

机译：定量扫描透射电镜直接观察SrTiO 3中的Sr空位

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Unveiling the identity, spatial configuration, and microscopic structure of point defects is one of the key challenges in materials science. Here, we demonstrate that quantitative scanning transmission electron microscopy (STEM) can be used to directly observe Sr vacancies in SrTiO 3 and to determine the atom column relaxations around them. By combining recent advances in quantitative STEM, including variable-angle, high-angle annular dark-field imaging and rigid registration methods, with frozen phonon multislice image simulations, we identify which Sr columns contain vacancies and quantify the number of vacancies in them. Picometer precision measurements of the surrounding atom column positions show that the nearest-neighbor Ti atoms are displaced away from the Sr vacancies. The results open up a new methodology for studying the microscopic mechanisms by which point defects control materials properties.
机译：揭示点缺陷的身份，空间配置和微观结构是材料科学中的关键挑战之一。在这里，我们证明了定量扫描透射电子显微镜（STEM）可用于直接观察SrTiO 3中的Sr空位并确定它们周围原子列的弛豫。通过结合定量STEM的最新进展，包括可变角度，高角度环形暗场成像和刚性配准方法，结合冷冻声子多层图像模拟，我们确定哪些Sr列包含空位并量化其中的空位数量。皮克计对周围原子列位置的精确测量表明，最近的Ti原子从Sr空位上移开了。该结果为研究微观机理提供了一种新的方法，通过微观机理，点缺陷控制了材料的性能。

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