Abstract
The relaxor behavior of lanthanum modified lead zirconate titanate (PLZT) ferroelectric ceramics, for aLa/Zr/Ti ratioof x/60/40, has been analyzed. An approximation to the dynamical behavior of the polar nano-regions(PNRs) has been discussed, taking into account a relaxation model, which considers adistribution function for the relaxation times. A good agreement between theoretical andexperimental results was obtained. The behaviors of the mean relaxation time and itsstandard deviation with temperature were discussed, considering the correlation betweenthe polar nano-regions and the freezing temperature. The temperature dependence of thepolarization showed an anomalous behavior around a temperature, which was associatedwith the freezing temperature, according to the proposed model in the present work.
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