Effect of Dy Substitution on Dielectric Properties of BTZ Relaxor Ceramics

Abstract

Perovskite types Ba1 − xDy2x/3Ti0.75Zr0.25O3 (with x = 0.0, 0. 025, 0.05) ceramics have been prepared through solid state reaction route. The room temperature XRD study suggests that all the compositions have single phase cubic symmetry with space group Pm-3m. Temperature dependent dielectric studies of the ceramics have been investigated in the frequency range from 50 Hz to 1 MHz. The densities of the samples are determined using Archemedes' principle and found to be ∼ 98% of x-ray density. The dielectric study revealed diffuse phase transition of second order. A broad dielectric anomaly coupled with the shift of dielectric maxima toward a higher temperature with increasing frequency indicates the relaxor-type behavior in the ceramics. There is drastic reduction in dielectric loss is observed. The diffusivity increases with increase in Dy contents in the studied composition range. The transition temperature decreases with increase in Dy contents due to the decrease in grain size.