Figure 1
From: Route to achieving perfect B-site ordering in double perovskite thin films
The effect of compressive in-plane strain on the BO6 octahedra of a cubic ABO3 structure on substrates with (001)-orientation (a) and (111)-orientation (b), where the green lines indicate a reduced dB-O and the red lines indicate an elongated dB-O compared to the non-strained BO6. Schematic drawings of the oxygen octahedra in perovskite films that contain anti-phase rotations after applying in-plane compressive strain are shown in (c and d); (c) for (001)-oriented films and (d) for (111)-oriented films. The oxygen ions are at the corners of the octahedra and the B cations are at the center of the octahedra. The A-site cations are not depicted but would lie in the open spaces between the octahedra. The cubes depict the pseudocubic ABO3 unit cell. The two different octahedra formed in a film on the (111)-oriented substrate are depicted in blue and red. The zig-zag pattern of the -O-B-O-B- chain is highlighted in black.
