Dielectric and Pyroelectric Properties of (Pb0.50Sr0.50)TiO3 Ceramics

Abstract

Lead strontium titanate (Pb0.50Sr0.50) TiO3 (PST) ceramics are prepared by the traditional ceramic processing. The dielectric constants and dielectric loss have been investigated in a temperature range from 25°C to 300°C. The maximum dielectric constants for unpoled and poled samples are 9924 and 9683, respectively. The temperatures of phase transition for unpoled and poled samples are observed at 153°C and 157°C, respectively. The phase-transition temperatures for unpoled and poled samples are not equal, which results from the polarization state of the domains. The remnant polarization and the coercive electric field are 18μC/cm2 and 6kV/cm, respectively, from polarization-electric field (P – E) hysteresis loop. The temperature dependence of pyroelectric coefficients of the PST ceramics is measured by a dynamic technique. The dielectric constant and loss tan δ of the poled PST ceramics are 813 and 0.010, respectively. The pyroelectric coefficients and figure of merit are 294μC/cm2K and 13.6 × 10-6 Pa-0.5, respectively, at room temperature 25°C and frequency 100Hz.