Identifying rotational symmetry axes in Kikuchi patterns by reciprocal vectors

Peng, Fan; Zhang, Yongsheng; Li, Wei; Miao, Hong; Zeng, Yi

doi:10.1111/jmi.13018

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…The length of the RLV is inversely proportional to the interplanar spacing rather than the bandwidth, and the direction of the RLV should be normal to the lattice plane rather than perpendicular to the Kikuchi band. In another study, 20 we discussed in detail the method of drawing reciprocal‐lattice vectors and the method of calculating the interplanar spacing and interplanar angle.…”

Section: Methods and Principlesmentioning

confidence: 99%

A new method for calculating interplanar spacing to distinguish between similar phases in EBSD

Peng

Zhang

Liu

et al. 2023

Journal of Microscopy

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Commercial electron backscatter diffraction (EBSD) systems generally use interplanar angle matching for pattern indexing, and thus, they are unable to distinguish between some similar phases with close interplanar angles, such as Al and Si. The interplanar spacing is more diagnostic but generally difficult to apply in pattern indexing because it lacks precision. In this study, we proposed an efficient approach for accurately measuring interplanar spacing by correcting the reciprocal-lattice vector (RLV). The phase discrimination of Al and Si was performed by interplanar spacing matching. The Kikuchi bands were identified automatically by the self-developed method using pattern rotation combined with grey gradient recognition without the help of human eyes. The reliable RLV relationship was extracted by accurately drawing reciprocal-lattice vectors.The lengths of RLVs were corrected, and then the RLVs were used for evaluating lattice spacing. The results of five Kikuchi patterns with different clarity showed that this new method reduced the average error of interplanar spacings by 50.611% and achieved an average accuracy of 1.644% for lattice spacing calculation. The method could distinguish structures with a difference in lattice spacing of at least 3.3%. This method was also effective for fuzzy patterns and partially missing Kikuchi bands and might be used as a new strategy for improving the calculation accuracy of lattice spacing for fuzzy patterns. The method did not have additional requirements concerning the number of detected Kikuchi bands and poles. The accuracy of lattice spacing could be effectively improved by correcting the RLVs based on routine pattern recognition. This method might be used as an auxiliary approach to differentiate between similar phases and is well-adapted to the existing commercial EBSD system.

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Section: Methods and Principlesmentioning

confidence: 99%

A new method for calculating interplanar spacing to distinguish between similar phases in EBSD

Peng

Zhang

Liu

et al. 2023

Journal of Microscopy

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“…Crystal symmetry. For discrimination between phases, symmetry in BKD patterns can be used (Dingley & Wright, 2009;Peng et al, 2021), but only if their symmetries are clearly different from each other. An unambiguous proof of actual symmetry in experimental BKD patterns is only possible if the lattice does not give rise to any suspicion of pseudosymmetry.…”

Section: Crystallographic Pseudosymmetrymentioning

confidence: 99%

Use of electron backscatter diffraction patterns to determine the crystal lattice. Part 3. Pseudosymmetry

Nolze¹,

Tokarski²,

Rychłowski³

2023

J Appl Cryst

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A pseudosymmetric description of the crystal lattice derived from a single wide-angle Kikuchi pattern can have several causes. The small size (<15%) of the sector covered by an electron backscatter diffraction pattern, the limited precision of the projection centre position and the Kikuchi band definition are crucial. Inherent pseudosymmetries of the crystal lattice and/or structure also pose a challenge in the analysis of Kikuchi patterns. To eliminate experimental errors as much as possible, simulated Kikuchi patterns of 350 phases have been analysed using the software CALM [Nolze et al. (2021). J. Appl. Cryst. 54, 1012–1022] in order to estimate the frequency of and reasons for pseudosymmetric crystal lattice descriptions. Misinterpretations occur in particular when the atomic scattering factors of non-equivalent positions are too similar and reciprocal-lattice points are systematically missing. As an example, a pseudosymmetry prediction depending on the elements involved is discussed for binary AB compounds with B1 and B2 structure types. However, since this is impossible for more complicated phases, this approach cannot be directly applied to compounds of arbitrary composition and structure.

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Identifying rotational symmetry axes in Kikuchi patterns by reciprocal vectors

Cited by 2 publications

References 18 publications

A new method for calculating interplanar spacing to distinguish between similar phases in EBSD

A new method for calculating interplanar spacing to distinguish between similar phases in EBSD

Use of electron backscatter diffraction patterns to determine the crystal lattice. Part 3. Pseudosymmetry

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