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Simultaneous fitting of X-ray and neutron diffuse scattering data.

D J Goossens1, T R Welberry, A P Heerdegen

  • 1Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia. goossens@tsc.anu.edu.au

Acta Crystallographica. Section A, Foundations of Crystallography
|December 21, 2006
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Summary
This summary is machine-generated.

This study refines short-range order models using X-ray and neutron diffuse scattering data. This approach reveals new insights into local atomic arrangements and molecular dynamics in crystalline materials.

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Area of Science:

  • Crystallography
  • Materials Science
  • Solid-State Physics

Background:

  • Conventional crystallographic refinement, using Bragg-peak intensities, yields only the average crystal structure.
  • Diffuse scattering in reciprocal space contains crucial information about short-range order and local atomic arrangements.
  • Previous methods could not fully exploit diffuse scattering for detailed structural analysis.

Purpose of the Study:

  • To present the first simultaneous refinement of a short-range-order model against both X-ray and neutron diffuse scattering data.
  • To investigate local order and molecular dynamics in the organic molecular crystal benzil.
  • To demonstrate the advantages of combining X-ray and neutron diffuse scattering data over using X-ray data alone.

Main Methods:

  • Simultaneous refinement of a short-range-order model against comprehensive X-ray and neutron diffuse scattering data.
  • Utilized the organic molecular crystal benzil (C(14)H(10)O(2), with deuterium substitution for neutron diffraction).
  • Automated refinement techniques for short-range order models.

Main Results:

  • Successfully refined a short-range-order model using combined X-ray and neutron diffuse scattering data.
  • Provided new insights into the local order and dynamic correlation structure of benzil.
  • Demonstrated the overcoming of limitations inherent in using only X-ray diffraction data.

Conclusions:

  • Simultaneous refinement against X-ray and neutron diffuse scattering is a powerful technique for studying local order.
  • This method offers deeper understanding of molecular dynamics within crystalline structures.
  • The approach enhances the characterization of crystalline materials beyond average structural parameters.