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RESEARCH PRODUCT

Radiation effects in transparent ferroelectric ceramics

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Radiation of different types ((gamma) -rays, electrons, neutrons) and fluence has been used to study the defect processes as well as the change of physical parameters in PLZT X/65/35 (X equals 4.5 - 11 at.%) and PbSc 0.5 Nb 0.5 O 3 (PSN) ceramics and to evaluate critical irradiation conditions. Effects on optical (extinction) spectra and dielectric characteristics (polarization, thermal and frequency dependences of dielectric permittivity (epsilon) and losses), dependent on composition and state of phase and polarization have been analyzed by means of annealing in isochronic and prolonged time regimes. A gradual shift of extinction edge to longer wavelengths, reduction of polarization and (epsilon) values, and a progressive diffusion of the phase transition including a defect-stimulated phase transformation from the rhombohedral to quasicubic structure in PLZT 6.5-8.5/65/36 compositions with the increase of irradiation fluence are observed in neutron irradiated ceramics. First radiation-induced electrical conductivity studies in PLZT ceramics are presented.