Abstract
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 <A> 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.
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