Abstract
We show that the use of the Landau-Devonshire theory of the perovskite ferroelectrics permits explanation of the main features of the morphotropic phase transition in the ceramic solid solutions Pb(Zr, Ti) O 3: the maximum of the dielectric constant and the ease with which the solutions can be poled, which results in a maximum of the polarization and a maximum of the coercive field. These two properties explain the maximum of the piezoelectric activity.
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