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Figure 7
Schematic representations of the atomic arrangement within the [FeSe] layer, (left) in the high-symmetry P4/nmm phase and (right) in the domain structure of the low-symmetry Cmme phase. The point group 4/mmm → mmm transition gives rise to different ferroelastic domain states (having different orientation states separated by domain walls; in the present case, the mirror plane perpendicular to the tetragonal x axis) with different spontaneous strains. Unit cells representative of the tetragonal and orthorhombic structures are highlighted [see also Fig. 1(b)].

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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