Effect of Fe and Mn doping at B-site of PLZT ceramics on dielectric properties

摘要

Iron (Fe) and manganese (Mn) doped lead lanthanum zirconate titanate (PLZT) ceramic powders have been synthesized by high temperature solid-state reaction method. Preliminary X-ray structural analysis of the compounds shows the formation of tetragonal structure. Detailed dielectric studies of the compounds as a function of temperature (from 300K to 600 K) at frequency 10 kHz suggest that the compounds undergo a diffuse phase transition. The transition temperature shifts towards higher side with decreasing the Zr ratio. The activation energy (Ea) of the samples was calculated from the plot of AC conductivity vs inverse of absolute temperature. Diffusivity (gamma) study of phase transition of these compounds provided its value between 1 and 2, indicating the variation of degree of disordering in the system.