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Figure 1
(a) Atomic displacement pattern corresponding to the non-symmetry breaking Γ1+ soft mode in LnFeAsO. (b) Relationship between the high-temperature tetragonal and low-temperature orthorhombic unit cells of β-FeSe (selected as representative; grey arrows show the effect of symmetry breaking on the Fe–Fe inter-atomic distances).

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 58| Part 5| October 2025| Pages 1789-1796
https://doi.org/10.1107/S1600576725007253
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