Issues »  Volume 5, Issue 3

Influence of the Broken Surface Layer on Dynamic Scattering in Crystals with Defects

A. P. Shpak, V. B. Molodkin, G. I. Nizkova, M. T. Kogut, Ye. V. Pervak

G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine

Received: 25.08.2004. Download: PDF

The model of scattering for a crystal with the disturbed surface layer (DSL) and randomly distributed defects (RDD) is proposed and developed within the framework of dynamical theory of the total integrated reflective power in Bragg-diffraction geometry. Within this model, the crystal is separated on three layers. The first layer is a layer heavily disturbed by the plastic deformation; within it, the diffraction is completely absent. This layer may be detected only due to the X-rays absorption within it. The first layer elastically deforms the second layer. Within it, a length of the scattering coherence is less than the extinction length, and consequently, the scattering within it has a kinematical character. The third layer is the dynamically scattering layer, which contains the RRD. On the base of this model, the new physical effects are revealed at Bragg-diffraction in such crystals, and consequently, the methods are proposed for the unique non-destructive quantitative diagnostics of the nanoscale characteristics of both DSL and RRD.

Keywords: X-rays, Bragg-diffraction, monocrystal, defect, disturbed surface layer.

PACS: 61.10.Dp, 61.10.Kw, 61.46.+w, 61.72.Dd, 61.72.Ff, 68.65.Ac

DOI: https://doi.org/10.15407/ufm.05.03.285

Citation: A. P. Shpak, V. B. Molodkin, G. I. Nizkova, M. T. Kogut, and Ye. V. Pervak, Influence of the Broken Surface Layer on Dynamic Scattering in Crystals with Defects, Usp. Fiz. Met., 5, No. 3: 285—312 (2004) (in Russian), doi: 10.15407/ufm.05.03.285

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