Total scattering measurements at the Australian Synchrotron Powder Diffraction beamline: capabilities and limitations

This study describes the capabilities and limitations of carrying out total scattering experiments on the Powder Diffraction (PD) beamline at the Australian Synchrotron, ANSTO. A maximum instrument momentum transfer of 19 Å−1 can be achieved if the data are collected at 21 keV. The results detail ho...

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Veröffentlicht in:Journal of synchrotron radiation 2023-03, Vol.30 (2), p.327-339
Hauptverfasser: D'Angelo, Anita M., Brand, Helen E. A., Mitchell, Valerie D., Hamilton, Jessica L., Oldfield, Daniel, Liu, Amelia C. Y., Gu, Qinfen
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Sprache:eng
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Zusammenfassung:This study describes the capabilities and limitations of carrying out total scattering experiments on the Powder Diffraction (PD) beamline at the Australian Synchrotron, ANSTO. A maximum instrument momentum transfer of 19 Å−1 can be achieved if the data are collected at 21 keV. The results detail how the pair distribution function (PDF) is affected by Qmax, absorption and counting time duration at the PD beamline, and refined structural parameters exemplify how the PDF is affected by these parameters. There are considerations when performing total scattering experiments at the PD beamline, including (1) samples need to be stable during data collection, (2) highly absorbing samples with a μR > 1 always require dilution and (3) only correlation length differences >0.35 Å may be resolved. A case study comparing the PDF atom–atom correlation lengths with EXAFS‐derived radial distances of Ni and Pt nanocrystals is also presented, which shows good agreement between the two techniques. The results here can be used as a guide for researchers considering total scattering experiments at the PD beamline or similarly setup beamlines. Total scattering data can be obtained on the PD beamline although there are constraints to the capabilities offered including longer acquisition times and necessary dilution of highly absorbing samples. This work details the considerations needed to successfully carry out total scattering studies on this bending‐magnet beamline, which has not been specifically designed for total scattering experiments.
ISSN:1600-5775
0909-0495
1600-5775
DOI:10.1107/S1600577522011614