Back to Search Start Over

High-accuracy transmission and fluorescence XAFS of zinc at 10 K, 50 K, 100 K and 150 K using the hybrid technique

Authors :
Marcus W. John
Daniel Sier
Ruwini S. K. Ekanayake
Martin J. Schalken
Chanh Q. Tran
Bernt Johannessen
Martin D. de Jonge
Peter Kappen
Christopher T. Chantler
Source :
Journal of Synchrotron Radiation, Vol 30, Iss 1, Pp 147-168 (2023)
Publication Year :
2023
Publisher :
International Union of Crystallography, 2023.

Abstract

The most accurate measurements of the mass attenuation coefficient for metals at low temperature for the zinc K-edge from 9.5 keV to 11.5 keV at temperatures of 10 K, 50 K, 100 K and 150 K using the hybrid technique are reported. This is the first time transition metal X-ray absorption fine structure (XAFS) has been studied using the hybrid technique and at low temperatures. This is also the first hybrid-like experiment at the Australian Synchrotron. The measured transmission and fluorescence XAFS spectra are compared and benchmarked against each other with detailed systematic analyses. A recent method for modelling self-absorption in fluorescence has been adapted and applied to a solid sample. The XAFS spectra are analysed using eFEFFIT to provide a robust measurement of the evolution of nanostructure, including such properties as net thermal expansion and mean-square relative displacement. This work investigates crystal dynamics, nanostructural evolution and the results of using the Debye and Einstein models to determine atomic positions. Accuracies achieved, when compared with the literature, exceed those achieved by both relative and differential XAFS, and represent a state-of-the-art for future structural investigations. Bond length uncertainties are of the order of 20–40 fm.

Details

Language :
English
ISSN :
16005775
Volume :
30
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Journal of Synchrotron Radiation
Publication Type :
Academic Journal
Accession number :
edsdoj.0aed2ab87f564f369c3189cea54a4dc5
Document Type :
article
Full Text :
https://doi.org/10.1107/S1600577522010293