Figure 1
From: Ferroelastic ___domain identification in BiFeO3 crystals using Raman spectroscopy

Typical Raman spectra measured in parallel (VV) polarisation using the 633 nm excitation line on the stripe ___domain (continuous line) and on the large ___domain (dotted line) of a (001)pc BFO crystal shown in the middle inset of the figure (polarisation microscopy image). Right inset: Alternative structural descriptions of BFO and their crystallographic relationship, using VESTA program44. Thick black lines terminate the rhombohedral unit cell (R3c). The unit cells plotted in purple and filled by the atoms are pseudo-cubic (R3m). The orange arrows mark the polarisation axis. The orthogonal (x,y,z) axes used for the Raman tensors are plotted in cyan. The gray object is an extended hexagonal elementary cell according to Doig et al.45.