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The evolutions of the ac sub-coercive-field dependent dielectric responses and ferroelectric properties with the temperature in (Pb,Sr)TiO3 (PST) films were investigated in this study. It was found that the remanent polarization (Pr) and coercive field (Vc) monotonically increase with the decreasing temperature, indicating that the ferroelectric domain wall (DW) motion is a thermal-driven processes...
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