fig5
Figure 5. In situ cooling TEM characterization of all four phases of BTO. A-E: BF TEM images obtained along [001] zone axis of the BTO sample. The scale bars are 500 nm; F: the plot shows temperature (T) vs. time, with points A-E highlighted at different temperatures, corresponding to BF-TEM images labeled A-E. T: Tetragonal; R: rhombohedral phases; O: orthorhombic; TEM: transmission electron microscopy; BTO: BaTiO3; BF: bright-field; DW: domain wall.
