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Contributions to the kinematical theory of diffraction contrast from screw dislocations
Author(s) -
Coghlan W. A.,
Nix W. D.
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.19680250221
Subject(s) - burgers vector , dislocation , foil method , diffraction , diffraction topography , contrast (vision) , optics , bragg's law , materials science , term (time) , basis (linear algebra) , physics , condensed matter physics , geometry , mathematics , quantum mechanics , composite material
The images of screw dislocations have been evaluated with the kinematical theory of electron diffraction using numerical techniques. The advantage of this method is that the periodic term in the diffracted intensity can be treated. It is found that because of this periodic term a screw dislocation for which n = g · b = 1 will be nearly invisible for certain foil thicknesses, deviations from the Bragg angle, and dislocation positions in the foil. On the basis of these findings, it is proposed that errors in Burgers vector determinations are possible.