Manual measurement of angles in backscattered and transmission Kikuchi diffraction patterns. Issue 2 (25th March 2020)

• Record Type: Journal Article
• Authors: Nolze, Gert; Tokarski, Tomasz; Cios, Grzegorz; Winkelmann, Aimo
• Is Part Of: Journal of applied crystallography. Volume 53:Issue 2(2020)
• Page Start: 435
• Page End: 443
• Publication Date: 2020-03-25
• Subjects: electron backscatter diffraction -- EBSD -- angle measurement -- gnomonic projections -- Kikuchi patterns -- Hilton net; Crystallography -- Periodicals; 548.05
• DOI: 10.1107/S1600576720000692
• Languages: English
• ISSNs: 0021-8898

Abstract

Abstract : Procedures are demonstrated which enable a manual determination of the angles between lattice planes and directions from electron backscatter diffraction patterns of unknown phases. The determination of the projection centre is described for cases where it is unknown. Abstract : A historical tool for crystallographic analysis is provided by the Hilton net, which can be used for manually surveying the crystal lattice as it is manifested by the Kikuchi bands in a gnomonic projection. For a quantitative analysis using the Hilton net, the projection centre as the relative position of the signal source with respect to the detector plane needs to be known. Interplanar angles are accessible with a precision and accuracy which is estimated to be ≤0.3°. Angles between any directions, e.g. zone axes, are directly readable. Finally, for the rare case of an unknown projection‐centre position, its determination is demonstrated by adapting an old approach developed for photogrammetric applications. It requires the indexing of four zone axes [ uvw ] i in a backscattered Kikuchi diffraction pattern of a known phase collected under comparable geometric conditions.