The frequency dependence of the coercive field E c in [001] c poled 0.71 Pb (Mg 1/3 Nb 2/3)
O 3–0.29 PbTiO 3 single crystals was investigated as a function of frequency f from 0.01 Hz
to 5 MHz. E c was found to be proportional to f β as predicted by the Ishibashi and Orihara
model, but our results showed two frequency regimes separated at around 1.0 MHz with
different β values. This change of switching kinetics may be due to the presence of slower
relaxation times for non–180 domain switching and heterogeneous nucleation of polar …