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(a) crystal at with the unit cell (small diamond) and three choices for the trimerization at 1270 K (large diamonds). (b) Ferroelectric crystal with tripled unit cell. Legend— ions: position in the unit cell; ions: local symmetry.
PFM images of the , , and faces of as-grown crystals from the same batch. Bright and dark areas correspond to ferroelectric domains with and , respectively.
High-resolution PFM images of the trimerization-polarization domains. [(a), (b), (d)] Exemplary images of the , , and face as discussed in the text. (c) Sketch of the domain structure in (b) showing trimerization and polarization walls as straight red lines and boundaries of gray areas, respectively. (e) Near-single domain with domains shrunk to stripes of . Note that closed-loop domains (arrow) are also observed.
Structure of trimerization and polarization domains and their response to an electric field. (a) and (b) Scenarios 1 and 2 as discussed in the text. , , , and dotted black lines denote the distribution of domains in the trimerized phase at . , , , and straight red lines denote the distribution of domains in the ferroelectric phase at . [(c) and (d)] PFM image of a faced crystal (c) before and (d) after tip-voltage poling.
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