Figure 5

(a) Intensity of the 172 cm⁻¹ mode shown as Raman map on an area of 24 µm × 24 µm (3 µm steps) indicated by the square in the polarisation microscopy image (in the top-left side). The arrows indicate the projections of the spontaneous polarisation on the sample surface. (b) Local EBSD map and (c) the corresponding idealized schematic ___domain structure. The ___domain boundaries are highlighted by dashed lines. The area marked in (b) by black square corresponds to the Raman map presented in (a). All four domains contain regions with crystallographically equivalent orientations. Different colours of the spots (red, brown, pink and blue) result from different local rhombohedral distortions that are associated with different orientations of the polarisation axis. The polarisation axes are depicted by orange arrows in figure (c), where also the dominant orientation variants are illustrated.