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Figure 5
The resonant phase shift in SKD LaFe4P12. (a) The structure factor phase δ of reflection 002 as a function of X-ray energy (solid line). Cubic unit cell of edge 7.8316 Å with origin at the La3+ ions (Jeitschko & Braun, 1977BB25). Colored circles are placed at the X-ray energies of the experimental data (see bottom panels). (b)–(d) Multiwavelength SKD 002 Φ scans collected on the Low-Energy Wiggler beamline of the Canadian Light Source (Leontowich et al., 2021BB34): (b) 6.705 keV, (c) 7.103 keV and (d) 7.314 keV. The reference for Φ = 0 is the [100] direction pointing upstream. MD peak position tracking between scans is indicated (dashed lines and arrows), as well as a few hkl indices of secondary reflections. As the energy increases, peaks with excitation geometries g = −1 (blue indices) and g = 1 (red indices) move in opposite senses: negative and positive, respectively. From the top (b) to the bottom (d) panel, peak asymmetries are observed to flip twice: HL → LH → HL or LH → HL → LH. (e) BC lines at 7.103 keV, slightly above the minimum energy for exciting MD [{\overline 4}55/{\overline 4}5{\overline 3}].

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 56| Part 5| October 2023| Pages 1574-1584
https://doi.org/10.1107/S1600576723005800
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