Method of X-Ray Diffraction Data Processing for Multiphase Materials with Low Phase Contents

  • A. D. Skorbun Institute for Safety Problems of Nuclear Power Plants, Nat. Acad. of Sci. of Ukraine https://orcid.org/0000-0001-8586-5713
  • S. V. Gabielkov Institute for Safety Problems of Nuclear Power Plants, Nat. Acad. of Sci. of Ukraine
  • I. V. Zhyganiuk Institute for Safety Problems of Nuclear Power Plants, Nat. Acad. of Sci. of Ukraine https://orcid.org/0000-0003-2579-0662
  • V. G. Kudlai Institute for Safety Problems of Nuclear Power Plants, Nat. Acad. of Sci. of Ukraine
  • P. E. Parkhomchuk Institute for Safety Problems of Nuclear Power Plants, Nat. Acad. of Sci. of Ukraine
  • S. A. Chikolovets Institute for Safety Problems of Nuclear Power Plants, Nat. Acad. of Sci. of Ukraine
Keywords: computer statistics, permutation test, statistical methods of analysis, crystalline phases, X-ray lines, X-ray phase and quantitative analysis, lava-like fuel-containing materials, quartz

Abstract

Amorphous, glass, and glass-ceramic materials practically always include a significant number (more than eight) of crystalline phases, with the contents of the latter ranging from a few wt.% to several hundredths or tenths of wt.%. The study of such materials using the method of X-ray phase analysis faces difficulties, when determining the phase structure. In this work, we will develop a method for the analysis of the diffraction patterns of such materials, when diffraction patterns include X-ray lines, whose intensities are at the noise level. The identification of lines is based on the search for correlations between the experimental and test lines and the verification of the coincidence making use of statistical methods (computer statistics). The method is tested on the specimens of a-quartz, which are often used as standard ones, and applied to analyze lava-like fuel-containing materials from the destroyed Chornobyl NPP Unit 4. It is shown that the developed technique allows X-ray lines to be identified, if the contents of separate phases is not less than 0.1 wt.%. The method also significantly enhances a capability to determine the phase contents quantitatively on the basis of lines with low intensities.

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Published
2019-10-11
How to Cite
Skorbun, A., Gabielkov, S., Zhyganiuk, I., Kudlai, V., Parkhomchuk, P., & Chikolovets, S. (2019). Method of X-Ray Diffraction Data Processing for Multiphase Materials with Low Phase Contents. Ukrainian Journal of Physics, 64(9), 870. https://doi.org/10.15407/ujpe64.9.870
Section
Structure of materials