Premium
Prediction of potential pseudo‐symmetry issues in the indexing of electron backscatter diffraction patterns
Author(s) -
Lenthe William,
Singh Saransh,
De Graef Marc
Publication year - 2019
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/s1600576719011233
Subject(s) - electron backscatter diffraction , autocorrelation , search engine indexing , diffraction , series (stratigraphy) , symmetry (geometry) , physics , crystal (programming language) , optics , materials science , computational physics , mathematics , crystallography , computer science , geology , geometry , chemistry , statistics , artificial intelligence , paleontology , programming language
A new methodology to predict potential pseudo‐symmetric or systematically mis‐indexed orientations for an arbitrary crystal structure is presented. The method leverages the recently proposed spherical indexing algorithm to index electron backscatter diffraction patterns. Potential pseudo‐symmetric orientations are interpreted as secondary peaks in the autocorrelation of the Kikuchi sphere. The generality of the method is illustrated using a number of crystal systems, ranging from nickel, where no significant pseudo‐symmetric issues are expected, to SrTiO 3 , with mild occurrence of such issues, to the olivine series, γ‐TiAl and U‐6%Nb systems, where the traditional Hough method systematically mis‐indexes the pseudo‐symmetric variants. Furthermore, the method predicts the severity of potential pseudo‐symmetric matches and ranks all variants using a normalized autocorrelation coefficient.