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Nullifying the extinction effect in XRD characterization of fibre textures

Published online by Cambridge University Press:  14 November 2013

I. Tomov and
S. Vassilev
I. Tomov*
Affiliation:
Acad. J. Malinowski Institute for Optical Materials and Technologies, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria
S. Vassilev
Affiliation:
Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria
*
*E-mail: iv.tomov39@gmail.com

Abstract

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To gain accuracy and, hence, physical reality of the data acquired by XRD measurements of fibre textures, a technique is elaborated to achieve experimental values, which are free of extinction effects. Its elaboration is based on combining basic definitions of the extinction theory and texture analysis. This technique is applicable to characterization of metal coatings that appear infinitely thick for X-rays. A nickel sample representing <100> + <221> texture components is used as a model. Resultant derived series of data on pole-density distribution of the {200} diffraction pole figure shows that the data corresponding to the main <100> texture component are strongly affected by extinction. On the contrary, due to definitions that require reduction of the intensity distribution to multiples of random density, the extinction-free values of the volume fraction of texture components do not differ substantially from those calculated by standard methods. Evidently, any of the standard methods for volume fraction measurements provides reasonable data if secondary extinction is even disregarded.

Keywords

extinctionextinction-free datafibre texturepole densityvolume fractionX-ray diffraction

Information

Type
Technical Articles
Information
Powder Diffraction , Volume 28 , Supplement S2 , September 2013, pp. S301 - S314
Copyright
Copyright © International Centre for Diffraction Data 2013 

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