Dielectric dispersion and ac conductivity behavior in tin-modified lead zirconate antiferroelectric single crystals

摘要

Frequency and temperature dielectric response and electrical conductivity behavior around the antiferroelectric-paraelectric phase transition temperature were studied in PbZr_(0.93)Sn_(0.07)O_3 antiferroelectric single crystals. The contribution of conductive processes to dielectric relaxation for the studied frequency range is discussed, considering oxygen vacancies and electronic transport. The relaxation processes below the transition temperature are associated with short-range polaronic hopping due to the interaction of the charge carriers (trapped electrons) with the distorted crystal lattice. Based on the specific coupling between electrons and phonons in the largely distorted oxygen octahedral sublattice of PbZr_(1-x)Sn_xO_3 crystals, an attempt to explain the formation of the incommensurate phase was undertaken.