Structural and dielectric properties of 0.75PMN-0.25PT relaxor ferroelectrics with different frequencies at room temperature

Abstract

In the present work, the composition of 0.75PMN-0.25PT solid solution was synthesized by columbite precursor method with multiple heat treatments at 920°C and 1200 °C. XRD data shows the perovskite structure with minimized pyrochlore phase and intense peaks. It has been observed that the pyrochlore phase can be reduced by increase in sintering temperature. SEM report shows the polygonal, dense and compact grain boundaries. Dielectric study shows the effect of variation in frequency to the dielectric constant and electrical conductivity at room temperature.