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Resolving pseudosymmetry in tetragonal ZrO 2 using electron backscatter diffraction with a modified dictionary indexing approach
Author(s) -
Pang Edward L.,
Larsen Peter M.,
Schuh Christopher A.
Publication year - 2020
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s160057672000864x
Subject(s) - tetragonal crystal system , electron backscatter diffraction , search engine indexing , diffraction , interpolation (computer graphics) , computer science , electron diffraction , crystallography , materials science , physics , optics , chemistry , crystal structure , artificial intelligence , image (mathematics)
Resolving pseudosymmetry has long presented a challenge for electron backscatter diffraction and has been notoriously challenging in the case of tetragonal ZrO 2 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 ZrO 2 , even with high degrees of binning and noise. The method is then used to index an experimental data set, 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 ZrO 2 . Source code for this implementation is available online.