The piezoelectric constants under two types of engineered domain configurations in perovskite-type oxide ferroelectrics were calculated in terms of the Landau-Devonshire-type free-energy function. It was found that the piezoelectric constants under the engineered domain configurations increase on approaching the morphotropic phase boundary, and diverge at the morphotropic phase boundary, if the free-energy function is truncated at the fourth order in the polarization. The physical properties of the engineered domain configurations were discussed.
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Iwata et al. (2001) studied this question.
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