Pyroelectric and Piezoresonant Responses in the Region of the AFE-FE Phase Transition of the Pb(Zr_1−xTi_x)O₃ Solid Solutions

The features of the temperature evolution of piezoresonance spectra, as well as the temperature dependences of the pyroelectric and dielectric properties of the PbZr_1-xTi_xO₃ system ferroelectric ceramic samples for 0.02 ≤ x ≤ 0.05 before and after thermostatting at T = 450 ℃ were studied. It has been established that after exposure to elevated temperature for more than 1 h, in all samples, upon cooling, an irreversible increase in the temperature of the phase transition from the ferroelectric to the antiferroelectric state is observed. Subsequent polarization with cooling through the Curie temperature does not restore the initial position of the phase transition point on the temperature scale in the samples. An assumption has been made about the connection between the observed phenomena and the ordering of clusters with a PbTiO₃ type structure, existing in the form of interlayers of elements of binary oxides ZrO₂ and TiO₂, coherently embedded in the crystalline matrix phase.