Application of contrast conditions to dynamical images of immobile dislocations
- 1 July 1976
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 34 (1) , 119-127
- https://doi.org/10.1080/14786437608228178
Abstract
In X-ray topography, the Burgers vector of a dislocation is usually determined by finding those diffracting planes for which the image of the dislocation becomes invisible. The conditions H – b = 0 and H – b × n = 0 would then be applied to determine the Burgers vector. In this paper, these conditions of invisibility have been applied to a particular pattern of straight line images observed by Borrmann disruption in thick crystals (μL>15) using many diffracting planes. It is found that the condition H – b = 0 alone is sufficient to determine that the images are caused by Lomer sessile edge dislocations. Furthermore, it is found that the condition H – b × n = 0 was not necessary to predict the invisibility of these images. This fact is attributed to the complexities of image formation by dynamical diffraction in imperfect crystals.Keywords
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