Abstract
Thermal and electric field hysteresis effects near the ferroelectric transition were studied by a high resolution calorimetry and dielectric spectroscopy in several solid and soft disordered ferroelectrics such as perovskite relaxors and P(VDF-TrFE)-based ferroelectric polymers, respectively. Significant thermal hysteresis effects were observed in PMN-PT and SBN crystals as well as in P(VDF-TrFE) polymers reminiscent of the supercooling effect in glassy systems. Electric field effect on phase sequence and stabilization of hysteresis effects was also studied in PMN-PT, SBN, and P(VDF-TrFE) disordered ferroelectrics via dielectric and calorimetric experiments. It is shown that the electric field stabilizes the ferroelectric phase or sequence of ferroelectric phases for materials close to morphotropic phase boundary and greatly reduces the thermal hysteresis effect.
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