Optical and structural investigations of PLZT x/65/35 (x = 4, 8 %) ferroelectric ceramics irradiated by a high-current pulsed electron beam

The results of measurements of Raman and infrared reflectivity spectra in the region of 50 - 5000 cm-1 obtained on (Pb(1-x)Lax)(Zr0.65Ti0.35)1-x/4O3 ceramics with x = 4 and 8 % and on the same ceramics but irradiated by a high-current pulsed electron beam are given. The beam parameters were: Ee = 250 keV, beam current Ie 1000 A, pulse duration τ = 300 ns. The real ε' and imaginary ε parts of permittivity were obtained by using the Kramers-Kronig method and the Lorentz oscillators model. The reconstruction effect of perovskite ABO3 structure of the irradiated PLZT ceramics has been found by means of X-ray diffraction measurements and as a consequence the changes of transverse and longitudinal phonon modes, oscillators strength, damping of the modes, the intensity of Raman frequencies have been registered by using the IR and Raman spectroscopy data. The mechanisms of the pulsed electron influence effect for 'hard ferroelectrics' PLZT 4/65/35 and for the relaxor PLZT 8/65/35 are analyzed