Abstract
A transformation of the initial three-layer domain structure in lithium tantalate with composition gradient and formation of charged domain wall (CDW) under application of ac electric field have been studied on the surface and in the bulk. We have demonstrated the abilities to produce several types of domain structure by ac field treatment: (1) a layer of the maze structure in the bulk with lower thickness and domain wall concentration, (2) a CDW situated just in the center of the plate, and (3) a decay of the initial domain structure leading to formation of large through domains.
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