Temperature dependent scaling behavior of 0.67PMN–0.33PT relaxor ferroelectric ceramics

Polarization reversal mechanisms are the key to understand the ferroelectric properties. The scaling behaviors of ferroelectric loops reveal the dynamic processes of ferroelectric domain's nucleation, growth, and reversal. Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN-PT) at morphotropic phase boundary (MPB) exhibits excellent piezoelectric and electromechanical properties. In this paper, the dynamic scaling behaviors of 0.67PMN-0.33PT ceramics at variable temperatures were investigated. Results indicate that, at the high electric field, the remanent polarization Pr, coercive field Ec, and hysteresis loops area decrease monotonically with the increase of temperature. While at a low electric field, they first increase and then decrease with increasing temperature. The scaling exponents a and b increase with the increase of temperature, indicating that the frequency and electric amplitude dependence of polarization reversal is enhanced with temperature.