Modes of Domain Wall Motion and Polarization of Lead Zirconate Titanate Polycrystals

概要

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Domain wall motion depending on polarization field has been studied for tetragonal lead zirconate titanate (PZT) polycrystals. The domain structure of PZT polycrystals was observed in a backscattered electron image obtained with a scanning electron microscope under various poling conditions. Domain wall reorientation was observed when the applied polarization field strength became higher than the coercive electric field. An <i>in situ</i> X-ray diffraction (XRD) measurement was also done to evaluate the domain wall motion contribution, under a polarization field. The XRD intensity ratio of (002) vs (200) reached as much as 0.72, which was explained by taking the both contributions of domain wall reorientation and translation. The experimental data and consideration by a geometrical domain wall motion model confirmed that the domain wall translation has zero threshold energy and the domain wall reorientation occurs beyond the coercive electric strength, corresponding to a finite threshold energy.
2011-09-25