Fig. 3: Domain structure and atomic local distortion.
From: Ultrahigh thermal stability and piezoelectricity of lead-free KNN-based texture piezoceramics
a SEM images for the 3T. b SEM images for 3R ceramics. c TEM images for the 3T ceramics. d TEM images for the 3R ceramics. e Atomically-resolved STEM HAADF image along [100], with an inset schematic projection of the ABO3 unit cell along the [100] zone axis, marked polarization directions for T and O phases. f The δNb-O displacement vector map and O and T regions are marked. g The contrast-reversed simultaneously acquired STEM ABF image superimposed with a map of atom polarization vectors. h Calculation of the key length of A sites. i Utilized the Z-contrast feature of STEM drawing the B-site intensity map. j Mapping of domain walls. k–m Enlarged images of local regions from the O phase, T phase, and the boundary of the O-T phase, extracted from (h–j) respectively. n Polarization direction histogram. o Calculation of the key length of B-site. p Utilized the Z-contrast feature of STEM drawing the B sites intensity map.
