Towards Mapping Perovskite Oxide 3-D Structure Using Two-Dimensional Pixelated STEM Detector
Towards Mapping Perovskite Oxide 3-D Structure Using Two-Dimensional Pixelated STEM Detector
复制标题
使用二维像素化 STEM 探测器绘制钙钛矿氧化物 3-D 结构
DOI：
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发表时间：
2016
影响因子：
2.8
通讯作者：
I. MacLaren
中科院分区：
文献类型：
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作者：
M. Nord;Andrew Ross;I. Hallsteinsen;T. Tybell;I. MacLaren
钙钛矿材料可以表现出广泛的特性，如超导性、磁性和压电性。这些不同的功能特性是由于结构-功能强耦合而产生的。晶格结构的微小变化会导致功能特性的巨大变化。特别是，钙钛矿异质结构最近引起了人们的极大兴趣，因为它可以通过衬底和薄膜之间的耦合来定制特性。然而，由于许多不同的参数会影响这些材料的性能，人们需要关于薄膜结构的详细信息，特别是在薄膜/衬底界面处。特别是，界面上八面体倾斜有序的促进或抑制，以及使用扫描透射电子显微镜（STEM）测量这一点非常有趣[1-3]。理想情况下，人们希望获得每个原子位置的精确信息，以获得完整的3-D结构。使用STEM通常可以获得与电子束正交的轴的高分辨率结构信息，但是这仍然留下一个轴未被解释。通常，需要在两个正交的带轴上薄化两个不同的tem片，才能获得所有三个轴的信息。然而，从一个样本的一个区域提取所有这些显然是有利的。
Perovskite materials can exhibit a wide range of properties like superconductivity, magnetism and piezoelectricity. These diverse functional properties emerge due to strong structure – function coupling. Small changes in lattice structure can lead to large changes in functional properties. In particular, perovskite heterostructures have recently attracted much interest due to the possibility of tailoring properties through coupling between substrate and film. However, due to the many different parameters that can affect the properties of these materials, one needs detailed information about the structure of the films, especially at the film/substrate interface. In particular, the promotion or suppression of octahedral tilt ordering at interfaces, and the measurement of this using scanning transmission electron microscopy (STEM) is of great interest [1-3]. Ideally one wants to have precise information about every atom position to get the full 3-D structure. Using STEM one can normally get high resolution structural information about the axes orthogonal to the electron beam, however this still leaves one axis unaccounted for. Normally, two different TEM-lamellae thinned on two orthogonal zone axes is required to get this information about all three axes. However, extracting all this from one region of one sample would obviously be advantageous.