Revealing phase boundaries by weighted parametric structural refinement

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  • Frederick Marlton
  • Stefano Checchia, European Synchrotron Radiation Facility, Lund University
  • ,
  • John Daniels, University of New South Wales (UNSW) Australia

Parametric Rietveld refinement from powder diffraction data has been utilized in a variety of situations to understand structural phase transitions of materials in situ. However, when analysing data from lower-resolution two-dimensional detectors or from samples with overlapping Bragg peaks, such transitions become difficult to observe. In this study, a weighted parametric method is demonstrated whereby the scale factor is restrained via an inverse tan function, making the phase boundary composition a refinable parameter. This is demonstrated using compositionally graded samples within the lead-free piezoelectric (BiFeO3)x (Bi0.5K0.5TiO3)y (Bi0.5Na0.5TiO3)1-x-y and (Bi0.5Na0.5TiO3)x (BaTiO3) 1-x systems. This has proven to be an effective method for diffraction experiments with relatively low resolution, weak peak splitting or compositionally complex multiphase samples.

Original languageEnglish
JournalJournal of Synchrotron Radiation
Volume26
Pages (from-to)1638-1643
Number of pages6
ISSN0909-0495
DOIs
Publication statusPublished - 1 Sep 2019

    Research areas

  • ferroelectrics, parametrics, powder diffraction, Rietveld refinement

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