Advanced

Powder diffraction in Bragg-Brentano geometry with straight linear detectors.

Kriegner, Dominik; Matej, Zdenek LU ; Kužel, Radomír and Holý, Václav (2015) In Journal of Applied Crystallography 48(Pt 2). p.613-618
Abstract
A common way of speeding up powder diffraction measurements is the use of one- or two-dimensional detectors. This usually goes hand in hand with worse resolution and asymmetric peak profiles. In this work the influence of a straight linear detector on the resolution function in the Bragg-Brentano focusing geometry is discussed. Because of the straight nature of most modern detectors geometrical defocusing occurs, which heavily influences the line shape of diffraction lines at low angles. An easy approach to limit the resolution-degrading effects is presented. The presented algorithm selects an adaptive range of channels of the linear detector at low angles, resulting in increased resolution. At higher angles the whole linear detector is... (More)
A common way of speeding up powder diffraction measurements is the use of one- or two-dimensional detectors. This usually goes hand in hand with worse resolution and asymmetric peak profiles. In this work the influence of a straight linear detector on the resolution function in the Bragg-Brentano focusing geometry is discussed. Because of the straight nature of most modern detectors geometrical defocusing occurs, which heavily influences the line shape of diffraction lines at low angles. An easy approach to limit the resolution-degrading effects is presented. The presented algorithm selects an adaptive range of channels of the linear detector at low angles, resulting in increased resolution. At higher angles the whole linear detector is used and the data collection remains fast. Using this algorithm a well behaved resolution function is obtained in the full angular range, whereas using the full linear detector the resolution function varies within one pattern, which hinders line-shape and Rietveld analysis. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Applied Crystallography
volume
48
issue
Pt 2
pages
613 - 618
publisher
Wiley-Blackwell
external identifiers
  • pmid:25844084
  • wos:000352229100035
  • scopus:84926330296
ISSN
1600-5767
DOI
10.1107/S1600576715003465
language
English
LU publication?
yes
id
0c3deff0-a4ed-4f43-8386-51dcaf30cb81 (old id 5345521)
date added to LUP
2015-04-30 10:16:40
date last changed
2017-08-27 03:41:39
@article{0c3deff0-a4ed-4f43-8386-51dcaf30cb81,
  abstract     = {A common way of speeding up powder diffraction measurements is the use of one- or two-dimensional detectors. This usually goes hand in hand with worse resolution and asymmetric peak profiles. In this work the influence of a straight linear detector on the resolution function in the Bragg-Brentano focusing geometry is discussed. Because of the straight nature of most modern detectors geometrical defocusing occurs, which heavily influences the line shape of diffraction lines at low angles. An easy approach to limit the resolution-degrading effects is presented. The presented algorithm selects an adaptive range of channels of the linear detector at low angles, resulting in increased resolution. At higher angles the whole linear detector is used and the data collection remains fast. Using this algorithm a well behaved resolution function is obtained in the full angular range, whereas using the full linear detector the resolution function varies within one pattern, which hinders line-shape and Rietveld analysis.},
  author       = {Kriegner, Dominik and Matej, Zdenek and Kužel, Radomír and Holý, Václav},
  issn         = {1600-5767},
  language     = {eng},
  number       = {Pt 2},
  pages        = {613--618},
  publisher    = {Wiley-Blackwell},
  series       = {Journal of Applied Crystallography},
  title        = {Powder diffraction in Bragg-Brentano geometry with straight linear detectors.},
  url          = {http://dx.doi.org/10.1107/S1600576715003465},
  volume       = {48},
  year         = {2015},
}