  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.
