用改进的字典索引法求解EBSD中四元体ZrO2的伪对称性
Resolving pseudosymmetry in tetragonal ZrO2 using EBSD with a modified dictionary indexing approach
摘要：
解决伪对称性长期以来一直是电子背散射衍射（EBSD）的一个挑战，特别是在四氢ZrO 2的情况下，这是众所周知的挑战。在这项工作中，提出了一种方法来解决伪对称的字典索引方法的基础上，并增加了它的应用程序的全局优化，以适应准确的模式中心，聚类的Hough索引方向集中在方向空间的字典，插值，以提高索引的解决方案的准确性。所提出的方法被证明解决伪对称性与100%的准确度在模拟图案的四相氧化锆，即使具有高度的分箱和噪声。然后，该方法被用来索引的实验数据集，这证实了它的能力，有效地和准确地解决这些材料中的伪对称性。本方法可以应用于解决各种材料中的伪对称性，甚至可能比四氢氧化锆更具挑战性。此实现的源代码可在线获得。
英文摘要：
Resolving pseudosymmetry has long presented a challenge for electron backscatter diffraction (EBSD) and has been notoriously challenging in the case of tetragonal ZrO2 in particular. In this work, a method is proposed to resolve pseudosymmetry by building upon the dictionary indexing method and augmenting it with the application of global optimization to fit accurate pattern centers, clustering of the Hough-indexed orientations to focus the dictionary in orientation space, and interpolation to improve the accuracy of the indexed solution. The proposed method is demonstrated to resolve pseudosymmetry with 100% accuracy in simulated patterns of tetragonal ZrO2, even with high degrees of binning and noise. The method is then used to index an experimental dataset, which confirms its ability to efficiently and accurately resolve pseudosymmetry in these materials. The present method can be applied to resolve pseudosymmetry in a wide range of materials, possibly even some more challenging than tetragonal ZrO2. Source code for this implementation is available online.
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