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Refining perovskite structures to pair distribution function data using collective Glazer modes as a basis.

Sandra Helen Skjærvø1, Martin A Karlsen2, Riccardo Comin3

  • 1Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, USA.

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|September 8, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a new computational model for analyzing octahedral tilts in perovskite structures. The model simplifies analysis by isolating tilt distortions, offering a clearer understanding of material properties.

Keywords:
geometric modellinginorganic materialsmaterials modellingoctahedral rotationspair distribution functionsperovskitesstructure refinement

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Area of Science:

  • Materials Science
  • Crystallography
  • Computational Chemistry

Background:

  • Modeling octahedral tilts in perovskites often involves complex symmetry constraints, leading to excess degrees of freedom.
  • Disentangling pure octahedral tilts from other structural distortions like cation displacements is challenging.

Purpose of the Study:

  • Develop and implement constraints for modeling pure octahedral tilts in perovskite structures.
  • Improve the analysis of pair distribution function (PDF) data for a more intuitive understanding of tilting.

Main Methods:

  • Developed specific constraints for modeling pure octahedral tilts.
  • Implemented these constraints within the diffpy-CMI software package for PDF data analysis.
  • Applied the model to CaTiO3, a perovskite with a known Glazer tilt system (α+β-β-).

Main Results:

  • The new model effectively separates rigid tilt features from non-rigid relaxations in PDF data.
  • It significantly reduces the number of refinable variables compared to unconstrained space-group models, ensuring robust refinements.
  • The model provides comparable fits to space-group models for CaTiO3 below 14 Å, highlighting its accuracy for rigid tilt components.

Conclusions:

  • The developed model offers a more robust and stable method for refining octahedral tilt components in perovskites.
  • It provides an intuitive way to visualize and analyze tilting phenomena in materials.
  • The approach is particularly effective for understanding the contributions of rigid tilts to the overall structure.