Figure 1: Atomic structure of surface in Pb(Zr0.2Ti0.8)O3 thin film.
From: Atomic mechanism of polarization-controlled surface reconstruction in ferroelectric thin films
(a) An atomically resolved annular bright-field (ABF) image of the negatively poled surface. The arrow indicates the polarization is downward in this domain. The viewing direction is along [010]. The atomic layers are labelled with the numbers. A schematic is overlaid with the ABF image in the up-right corner. Scale bar, 0.5 nm. (b) The enlarged view of the rectangle region in a. The contrast is inverted for clarity. The white outlines show that the oxygen at the 3rd layer shifts to the right direction opposite to the oxygen shift at the 5th layer. (c) Schematic showing that δ1 is the relative displacement of ZrO/TiO column respective to the four neighbouring Pb columns. (d) Schematic showing that δ2 is the relative displacement of Pb column respective to the four neighbouring O columns. (e) Schematic showing that δ3 is the relative displacement of ZrO/TiO column respective to the four neighbouring O columns.
