LOCALIZED POLARIZATION IN PEROVSKITE TITANATE SINGLE-CRYSTAL AND CERAMICS

The thermal stimulated current (TSC) in perovskite titanates both of s ingle crystal and polycrystalline forms has been studied with special reference to the charges which are assumed to be located on crystal su rfaces and contribute to ultra-low frequency dielectric relaxation. A set of experimental results, voltage dependence of the polarized charg e either on thickness or grain size and ground-off characteristics on poled specimens, indicates the charges localized at the anodic side of each crystal grain.