Fig. 6

Polarisation-electric field hysteresis loops recorded in the vicinity of the first-order phase transition (a) and in ferroelectric phase III (b), and the temperature dependence of spontaneous polarisation (c).
Polarisation-electric field hysteresis loops recorded in the vicinity of the first-order phase transition (a) and in ferroelectric phase III (b), and the temperature dependence of spontaneous polarisation (c).