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Shift of Extinction Contours due to the Presence of Dislocations
Author(s) -
Siems R.,
Delavignette P.,
Amelinckx S.
Publication year - 1963
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.19630030507
Subject(s) - burgers vector , dislocation , sign (mathematics) , deformation (meteorology) , curvature , bent molecular geometry , geometry , orientation (vector space) , extinction (optical mineralogy) , diffraction , optics , position (finance) , foil method , twist , line (geometry) , materials science , physics , condensed matter physics , mathematics , mathematical analysis , finance , economics , composite material
The deformation of prisms and elliptical cylinders, resulting from the presence of an arbitrary dislocation line parallel to one of the main axes of the cross‐sections is discussed. It is shown that in general the specimen is both bent and twisted. The deformation appears in the electron microscope as a shift of the extinction contours where these cross the dislocations. The sign and magnitude of the shift depend on the magnitude, the sign and the orientation of the Burgers vector with respect to the dislocation line, as well as on the operating diffraction vector and local curvature of the foil. For a particular dislocation in tin disulfide it has been possible to verify the theory in detail.