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The Fine Structure of Spots in Electron Diffraction Resulting from the Presence of Planar Interfaces and Dislocations. IV. Wedge Crystals
Author(s) -
de Ridder R.,
van Landuyt J.,
Gevers R.,
Amelinckx S.
Publication year - 1968
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19680300240
Subject(s) - wedge (geometry) , diffraction , planar , crystal twinning , materials science , crystal (programming language) , optics , electron diffraction , grain boundary , condensed matter physics , crystallography , electron , geometry , molecular physics , physics , chemistry , composite material , mathematics , microstructure , computer graphics (images) , quantum mechanics , computer science , programming language
The fine structure of electron diffraction spots caused by the presence of wedge shaped crystal parts in a selected area, is derived theoretically and compared with observations. The same method has been applied in parts I and III i.e. a Fourier transformation of the transmitted and scattered intensities. Two general types of wedges are considered; wedges formed by grain‐boundary and twin boundary arrangements where only one crystal part is in a reflecting position and general wedges as e.g. the genuine wedges of geometrically shaped crystals. Normal and anomalous absorption are taken into account, as well as refraction effects in the case of a genuine wedge. MgO crystals and twin boundaries in stainless steel were used to compare the theoretical results with experiment. The observations are in very good agreement with the predicted fine structure.