Hostname: page-component-cd9895bd7-q99xh Total loading time: 0 Render date: 2024-12-25T08:04:37.369Z Has data issue: false hasContentIssue false
  • English
  • Français

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: [email protected]
Get access Rights & Permissions [Opens in a new window]

Abstract

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Bragg, W. L., James, R. W. and Bosanquet, C. H. (1921). “The intensity of reflection of x-rays by rock salt. - Part II,” Philos. Mag. 42, 1–17.Google Scholar
Bunge, H. J. (1982). Texture Analysis in Materials Science: Mathematical Methods. (Butterworths, London).Google Scholar
Bunge, H. J. (1988). “Texture and directional properties of materials” in Directional Properties of Materials, edited by Bunge, H. J. (DMG Informationgeselschaft mbH, Oberursel 1), pp. 1–63.Google Scholar
Chandrasekhar, S. (1960). “Extinction in x-ray crystallography,” Adv. Phys. 9, 363–385.Google Scholar
Darwin, C. G. (1922), “Reflection of x-rays from imperfect crystals,” Philos. Mag. 43, 800–829.Google Scholar
Guinier, A. (1956). Theorie et Techn. de la Radiocristallographie, (Dunod, Paris).Google Scholar
James, R. W. (1965). The Optical Principles of the Diffraction of X-Rays, (G.Bell and Sons LTD, London).Google Scholar
Kleber, W. (1970). An Introduction to Crystallography, (VEB Verlag Technik, Berlin).Google Scholar
Sabine, T. M. (1988). “A reconciliation of extinction theories,” Acta Crystallogr., Sect. A: Found. Crystallogr. 44, 368–374.Google Scholar
Sabine, T. M. (1992). “The flow of radiation in real crystals,” in International Tables for Crystallography, edited by Wilson, A. J. C.. (Kluwer Akademik Publishers, Dordrecht), Vol. C. pp. 530–536.Google Scholar
Tomov, I., Schlaefer, D., Kuettner, K. (1977). “Bestimmung der Mengenanteile von Fasertexturen,” Kristall u. Technik, 12, 709–715.Google Scholar
Tomov, I., Bunge, H. J. (1979). “An analytical method for quantitative determination of volume fractions in fibre textures,” Texture Cryst. Solids, 3, 73–84.Google Scholar
Tomov, I. (2011). “Extinction in textures: Nullifying the extinction effect,” Bulg. Chem. Commun. 43, 325–333.Google Scholar
Zachariasen, W. H. (1963). “The secondary extinction correction,” Acta Crystallogr. 16, 1139–1145.Google Scholar
Zachariasen, W. H. (1967). “A general theory of x-ray diffraction in crystals,” Acta Crystallogr. 23, 558–564.Google Scholar