Application of Multirank Lamination to the Simulation of Polarization Switching in Rhombohedral Ferroelectric Crystals
Date Issued
2011
Date
2011
Author(s)
Wei, Yu-Chieh
Abstract
This thesis develops a mesoscopic electromechanical model to investigate the switching behavior of rhombohedral ferroelectric single crystals. The model is based on the multirank laminated domain pattern to insure the satisfaction of electromechanical compatibility condition. The result is applied to the study of actuation strain of a flat-plate device where a fixed compressive stress and a cycling electric field are applied normal to the plate.
It is first shown that the largest actuation strain can be induced when the crystal is oriented along the [111] direction. Different from the case of tetragonal ferroelectric crystals where there is only one non-180° switching (90° switching), rhombohedral ferroelectric crystals possess two non-180° switchings (71° and 109° switchings). As a result, it is found that the switching behavior varies significantly depending on the relative magnitudes of 71° and 109° coercive fields. It is shown that larger actuation strain can be achieved by lowing 109° coercive field.
Subjects
Ferroelectric material
Multirank lamination
Electromechanical processes
Domain switching
Type
thesis
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