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The asymmetry of the lobe contrasts in two‐beam TEM as a test to obtain the Burgers vector of an inclined relaxing dislocation
Author(s) -
Belgacem Chokri Hadj,
Ati Abdelaziz,
Bonnet Roland
Publication year - 2005
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.200409090
Subject(s) - burgers vector , dislocation , perpendicular , relaxation (psychology) , asymmetry , optics , transmission electron microscopy , condensed matter physics , beam (structure) , materials science , lobe , physics , geometry , mathematics , anatomy , quantum mechanics , psychology , social psychology , medicine
It is suggested that, if the elastic relaxation effect of an inclined dislocation at both free surfaces of a thin plate is taken into account, the determination of its Burgers vector b in two‐beam transmission electron microscopy can be obtained with a notable reduction of experimental work. The relaxation effect produces in general an asymmetric aspect of the lobe contrasts, with respect to a medium line perpendicular to the dislocation image segment. Indeed, from a re‐examination of about twenty micrographs of dislocations located in two different materials, it is concluded that a single experimental image is often sufficient to derive b . In no case three experimental images obtained with non‐coplanar diffracting vectors were found necessary to obtain unambiguously b .