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An off-normal fibre-like texture in thin films on single-crystal substrates

机译：单晶衬底上薄膜中的异常纤维状纹理

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摘要

In the context of materials science, texture describes the statistical distribution of grain orientations. It is an important characteristic of the microstructure of polycrystalline films, determining various electrical, magnetic and mechanical properties. Three types of texture component are usually distinguished in thin films: random texture, when grains have no preferred orientation; fibre texture, for which one crystallographic axis of the film is parallel to the substrate normal, while there is a rotational degree of freedom around the fibre axis; and epitaxial alignment (or in-plane texture) on single-crystal substrates, where an in-plane alignment fixes all three axes of the grain with respect to the substrate. Here we report a fourth type of texture―which we call axiotaxy―identified from complex but symmetrical patterns of lines on diffraction pole figures for thin films formed by solid-state reactions. The texture is characterized by the alignment of planes in the film and substrate that share the same d-spacing. This preferred alignment of planes across the interface manifests itself as a fibre texture lying off-normal to the sample surface, with the fibre axis perpendicular to certain planes in the substrate. This texture forms because it results in an interface, which is periodic in one dimension, preserved independently of interfacial curvature. This new type of preferred orientation may be the dominant type of texture for a wide class of materials and crystal structures.
机译：在材料科学的背景下，纹理描述了晶粒取向的统计分布。它是多晶膜微结构的重要特征，它决定了各种电，磁和机械性能。薄膜中通常区分三种类型的纹理成分：随机纹理（当晶粒没有首选取向时）；纤维织构，薄膜的一个结晶轴平行于基底法线，同时绕纤维轴有旋转自由度；以及单晶衬底上的外延取向（或面内织构），其中面内取向将晶粒的所有三个轴相对于衬底固定。在这里，我们报告了第四种纹理，我们称其为轴心形，它是由固态反应形成的薄膜的衍射极图上复杂但对称的线条图案所标识的。纹理的特征在于，膜和基板中共享相同d间距的平面对齐。跨界面的平面的这种优选对准将其自身表现为垂直于样品表面的纤维质地，其中纤维轴垂直于基底中的某些平面。之所以形成这种纹理，是因为它会形成一个界面，该界面在一个维度上是周期性的，并且与界面曲率无关地得以保留。对于各种各样的材料和晶体结构，这种新型的首选方向可能是纹理的主要类型。

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