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A simple solution to the Rietveld refinement recipe problem.

B H Toby1

  • 1Argonne National Laboratory, 9700 S. Cass Avenue, 401/B4192, Lemont, IL 60439, USA.

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|February 7, 2024
PubMed
Summary

This study introduces a new method to automate Rietveld refinement, a complex process in materials science. The technique calculates the optimal order for adding parameters, simplifying analysis and improving accuracy for researchers.

Keywords:
GSAS-IIRietveld analysisparameter selectionpowder diffraction

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Area of Science:

  • Materials Science
  • Crystallography
  • Computational Science

Background:

  • Rietveld refinement is a crucial technique in materials science for analyzing crystalline structures.
  • Current Rietveld refinement processes often demand significant expert knowledge for accurate parameterization.
  • The order of parameter addition can critically influence the success and reliability of the refinement.

Purpose of the Study:

  • To develop a computational mechanism for determining the optimal order of parameter addition in Rietveld refinements.
  • To enhance the accessibility and efficiency of Rietveld refinement procedures.
  • To advance the development of automated Rietveld refinement technologies.

Main Methods:

  • The study implements a method to compute partial derivatives of the fitting function with respect to each parameter.
  • Parameters are systematically incremented and decremented to evaluate their impact on the refinement.
  • Numerical computational errors are discriminated from meaningful parameter contributions.

Main Results:

  • A novel mechanism for computing the next parameter to add to a Rietveld refinement has been demonstrated.
  • The method provides a systematic way to guide the parameterization process.
  • Implementation details within the GSAS-II open-source software are discussed.

Conclusions:

  • The developed mechanism represents a significant step towards automating Rietveld refinement.
  • This approach can reduce the reliance on expert input, making the technique more accessible.
  • Further development promises more robust and user-friendly automated crystallographic analysis tools.