Radiation effects on optical and dielectric properties of PLZT and PSN ceramics

The effects of /spl gamma/-ray, electron and neutron (fluences up to 2.10/sup 18/ n/cm/sup 2/) irradiation on extinction spectra and dielectric characteristics (hysteresis, thermal and frequency dependencies of dielectric permittivity /spl epsi/ and losses) in PLZT X/65/35 (X=4.5-11 at%) and PbSc/sub 0.5/Nb/sub 0.5/O/sub 3/ ceramics are analyzed with respect to composition state of phase, and polarization by means of annealing in isochronic and prolonged time regimes. A gradual shift of extinction edge to longer wavelengths, reduction of polarization and /spl epsi/ values, and a progressive diffusion of the phase transition with the increase of irradiation fluence are observed in neutron irradiated PLZT ceramics.