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Related Experiment Videos

DAFS experiments with non-centrosymmetric single crystals.

D C Meyer1, K Richter, A Seidel

  • 1Institut für Kristallographie und Festkörperphysik, Fachrichtung Physik der TU, D-01062 Dresden, Germany.

Journal of Synchrotron Radiation
|May 12, 2006
PubMed
Summary

Diffraction anomalous fine structure (DAFS) experiments reveal insights into crystal structures. This study demonstrates DAFS

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Structure variations within RSi<sub>2</sub> and R<sub>2</sub>TSi<sub>3</sub> silicides. Part I. Structure overview.

Acta crystallographica Section B, Structural science, crystal engineering and materials·2020

Area of Science:

  • Materials Science
  • Solid-State Physics
  • Crystallography

Background:

  • Diffraction anomalous fine structure (DAFS) is a powerful technique for probing atomic structures.
  • Understanding crystal symmetry is crucial for interpreting DAFS data.
  • Epitaxially grown (Ga,In)P on GaAs serves as a model system for single-crystal analysis.

Purpose of the Study:

  • To detail the methodology for reliable DAFS measurements on single crystals.
  • To analyze the complex-valued fine-structure function of the scattering factor.
  • To investigate the impact of crystal symmetry, specifically the lack of inversion symmetry, on DAFS signals.

Main Methods:

  • Performed DAFS experiments on an epitaxially grown (Ga,In)P layer on a [001] GaAs substrate.

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  • Precisely controlled Bragg reflection positions during photon energy scans.
  • Quantitatively analyzed reflection intensities to derive the fine-structure function.

    • Main Results:

    • Established reliable measurement protocols for DAFS on single crystals.
    • Demonstrated that the lack of inversion symmetry significantly influences the DAFS signal.
    • Obtained the complex-valued fine-structure function of the scattering factor for the model system.

    Conclusions:

    • DAFS is a viable technique for single-crystal structure analysis.
    • The study highlights the sensitivity of DAFS to crystal symmetry, including the absence of inversion symmetry.
    • DAFS holds potential for contributing to detailed structural investigations of materials.