Figure 3
From: Large magnetoelectric coupling in magnetically short-range ordered Bi5Ti3FeO15 film
HAADF STEM image (a) of a BTFO thin film obtained by the state-of-the-art aberration corrected STEM instrument, which shows three layers of Bi atoms (Bi3Ti4O13)2− sandwiched by two closely stacked Bi layers of (Bi2O2)2+. Between the two (Bi2O2)2+ layers, there are four Ti(Fe)O6 octahedra. The insets show a typical image of the unit cell and its pseudo-colour representation. Individual columns of Bi and Ti/Fe atoms are clearly recognized. A schematic diagram of the Aurivillius structure of BTFO is shown in (b).
