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Alfred Larsson. Portrait.

Alfred Larsson

Postdoctoral fellow

Alfred Larsson. Portrait.

Quantitative powder diffraction using a (2 + 3) surface diffractometer and an area detector

Author

  • Giuseppe Abbondanza
  • Alfred Larsson
  • Francesco Carlá
  • Edvin Lundgren
  • Gary S. Harlow

Summary, in English

X-ray diffractometers primarily designed for surface X-ray diffraction are often used to measure the diffraction from powders, textured materials and fiber-texture samples in 2θ scans. Unlike in high-energy powder diffraction, only a fraction of the powder rings is typically measured, and the data consist of many detector images across the 2θ range. Such diffractometers typically scan in directions not possible on a conventional laboratory diffractometer, which gives enhanced control of the scattering vector relative to the sample orientation. There are, however, very few examples where the measured intensity is directly used, such as for profile/Rietveld refinement, as is common with other powder diffraction data. Although the underlying physics is known, converting the data is time consuming and the appropriate corrections are dispersed across several publications, often not with powder diffraction in mind. This paper presents the angle calculations and correction factors required to calculate meaningful intensities for 2θ scans with a (2 + 3)-type diffractometer and an area detector. Some of the limitations with respect to texture, refraction and instrumental resolution are also discussed, as is the kind of information that one can hope to obtain.

Department/s

  • Synchrotron Radiation Research
  • NanoLund: Centre for Nanoscience

Publishing year

2021-08-01

Language

English

Pages

1140-1152

Publication/Series

Journal of Applied Crystallography

Volume

54

Issue

4

Document type

Journal article

Publisher

International Union of Crystallography

Topic

  • Chemical Sciences
  • Physical Sciences

Keywords

  • Powder diffraction
  • Rietveld refinement
  • Angle calculations
  • Grazing incidence
  • Area detectors

Status

Published

ISBN/ISSN/Other

  • ISSN: 1600-5767