Speaker
Dr
Hasmik Manukyan
(Yerevan State University)
Description
The problem is considered of a dynamic reflection of a plane monochromatic X-ray wave at the trapeziform model of superlattice with a stacking fault between layers when absorption is taken into account.
When a plane monochromatic X-ray wave is incident on a superlattice double diffraction occurs, first by atomic planes causing the formation of a modulated X-ray wave in the crystalline medium, and then by diffraction of the latter by the interfaces between layers, since the layer structure acts as a diffraction grating. Being important in applications, superlattice perfection has been investigated by various methods of X-ray and electron microscopy analysis. One of the possible defects impairing superlattice parameters is a stacking fault.
In this paper we develop the theory of X-ray diffraction on trapeziform model of one-dimensional superlattice with a stacking fault between the layers when absorption is taken into account.
As is known, the interference absorption factor of a multilayered crystalline system has oscillating character. We obtained, that presence of stacking fault reduces the interference absorption factor, maintaining its oscillations. At the same time, the closer stacking fault is to the crystalline surface, the less impact it has on the interference absorption factor.
Author
Dr
Hasmik Manukyan
(Yerevan State University)
Co-author
Dr
Susanna Manukyan
(Yerevan State University)
