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Related Experiment Videos

Extinction-free electron diffraction refinement of bonding in SrTiO3.

Jesper Friis1, Bin Jiang, John Spence

  • 1Department of Physics, Norwegian University of Science and Technology, Trondeheim, Norway. jesper.friis@material.ntnu.no

Acta Crystallographica. Section A, Foundations of Crystallography
|October 13, 2004
PubMed
Summary

Quantitative convergent-beam electron diffraction precisely measured crystal potential in SrTiO3, yielding accurate X-ray structure factors. This enables detailed analysis of chemical bonding, revealing covalent Ti-O bonds and ionic Sr-O bonds.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Crystallography

Background:

  • Accurate determination of crystal potential and structure factors is crucial for understanding chemical bonding in materials.
  • Conventional X-ray diffraction methods have limitations in achieving high accuracy for low-order reflections.

Purpose of the Study:

  • To measure accurate low-order Fourier coefficients of the crystal potential of Strontium Titanate (SrTiO3) using quantitative convergent-beam electron diffraction (qCBED).
  • To derive highly accurate X-ray structure factors and investigate chemical bonding characteristics within SrTiO3.

Main Methods:

  • Quantitative convergent-beam electron diffraction (qCBED) was employed to measure crystal potential.
  • The derived structure factors were combined with high-order X-ray diffraction data.

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  • A multipole model was fitted to the experimental data to analyze bonding.

    • Main Results:

    • Accurate low-order X-ray structure factors for SrTiO3 were obtained with approximately 0.1% accuracy.
    • The achieved accuracy surpasses conventional X-ray diffraction and matches the X-ray Pendellösung method.
    • Analysis revealed a covalent component in the Titanium-Oxygen (Ti-O) bond and a predominantly ionic Strontium-Oxygen (Sr-O) bond.

    Conclusions:

    • Quantitative convergent-beam electron diffraction is a powerful technique for precise determination of crystal potentials and X-ray structure factors.
    • The study provides detailed insights into the nature of chemical bonding in SrTiO3, highlighting the role of Ti 3d electrons.
    • The findings contribute to a deeper understanding of structure-property relationships in perovskite materials.