Figure 7: Properties of polarization switching for 3.

(a) P−E hysteresis loops measured at different temperatures along the a axis by the Sawyer–Tower circuit method. Inset: P−E dependences of 1 and 2 at 240 K. (b) Calculated ferroelectric polarization along the path connecting the centrosymmetric (λ=0) to polar structure (λ=1). Both the module (black) and components of the vector along the a and c axis (red/blue) were plotted.