fig2
From: Commentary on “Heterogenous nature of enhanced piezoelectricity in relaxor-ferroelectric crystals”

Figure 2. (A) Transmission electron microscopy image showing the presence of tweed-like structures in PMN-35PT. Reproduced with permission[8]. Copyright 1995 AIP Publishing LLC. (B) Polarized light PLM (top) and piezo-force PFM microscopy (bottom) images. Reproduced with permission[13]. Copyright 2005 AIP Publishing LLC. (C) Temperature dependence of the general invariance condition of equation (3.13). Reproduced with permission[16]. Copyright 2003 AIP Publishing LLC.