  We investigated the effect of uniaxial pressure (0-1000 bars) applied
parallely to the ac electric field on dielectric properties of PLZT-x/65/35 (2
\leqslant x \leqslant 13) ceramics. There was revealed a significant effect of
the external stress on these properties. The application of uniaxial pressure
leads to the change of the peak intensity of the electric permittivity
(\varepsilon), of the frequency dispersion as well as of the dielectric
hysteresis. The peak intensity $\varepsilon$ becomes diffused/sharpened and
shifts to a higher/lower temperatures with increasing the pressure. It was
concluded that the application of uniaxial pressure induces similar effects as
increasing the Ti ion concentration in PZT system. We interpreted our results
based on the domain switching processes under the action of combined
electromechanical loading.
