Abstract
The domain structures of Bi4−xLaxTi3O12 (BLT) ceramics (where x = 0, 0.5, 0.75, and 1.0) have been investigated by transmission electron microscopy. The morphology ofthe 90° domain walls were found to be curved due to a decrease of thespontaneous strain energy after doping with La. Movement of the90° domainwalls was observed in situ under electron beam irradiation. It is indicated that the irregular and active90° domainwalls in BLT0.75 result from a decrease in internal stress. It is suggested that the existence of irregular andactive 90° domains in BLT0.75 has an important effect on the remanent polarization, and fatigueproperties.
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