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Effects of Voigt diffraction peak profiles on the pair distribution function

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Powder diffraction and pair distribution function (PDF) analysis are well established techniques for investigation of atomic configurations in crystalline materials, and the two are related by a Fourier transformation. In diffraction experiments, structural information, such as crystallite size and microstrain, is contained within the peak profile function of the diffraction peaks. However, the effects of the PXRD (powder X-ray diffraction) peak profile function on the PDF are not fully understood. Here, all the effects from a Voigt diffraction peak profile are solved analytically, and verified experimentally through a high-quality X-ray total scattering measurement on Ni powder. The Lorentzian contribution to the microstrain broadening is found to result in Voigt-shaped PDF peaks. Furthermore, it is demonstrated that an improper description of the Voigt shape during model refinement leads to overestimation of the atomic displacement parameter.

Original languageEnglish
JournalActa crystallographica. Section A, Foundations and advances
VolumeA78
IssuePart 1
Pages (from-to)10-20
Number of pages11
DOIs
Publication statusPublished - Jan 2022

    Research areas

  • pair distribution function, peak profile, size effects, strain effects, Voigt function

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