High Temperature Dielectric Properties of PMN‐PSN‐PZN Relaxors.

In this paper, the results of dielectric investigations on four different solid solutions of PbMg1/3Nb2/3O3‐PbSc1/2Nb1/2O3‐PbZn1/3Nb2/3O3 (PMN‐PSN‐PZN) are presented in a wide temperature range (from room temperature to 1100 K). At higher temperatures (above 600 K) and low frequencies, the electrical conductivity dominates in properties of these ceramics and the Maxwell–Wagner relaxation appears. The DC conductivity has some change in slope close to the Burns temperature. The value of conductivity activation energy is typical for oxygen vacancies conductivity. Close to the Burns temperature, anomalous behavior of the intrinsic dielectric permittivity is also observed due to the appearance of dielectric relaxation in the terahertz frequency range caused partially by dynamics of polar nanoregions and mainly by overdamped optical soft mode which softens toward T*. [ABSTRACT FROM AUTHOR]