Dielectric and piezoelectric properties of (1-x)[Pb(Mg0.5W 0.5)O3]-xPbTiO3 ceramics

Abstract

Several compositions of solid solution (1-x)[Pb(Mg0.5W 0.5)O3]-xPbTiO3 (PMW-xPT) have been prepared by a modified B-site precursor method and dielectric and piezoelectric properties were studied in the composition range 0.42 ≤ x ≤ 0.72. Temperature dependence of the dielectric constant show diffuse nature of the phase transitions for the compositions lying in the cubic (x ≤ 0.42) and two phase region (0.46 ≤ x < 0.68) while it shows normal ferroelectric transition for tetragonal compositions (x ≥ 0.68). Temperature dependence of dielectric constant for the compositions in the two phase region shows two dielectric anomalies above room temperature and not just one as reported by earlier workers. Maximum piezoelectric response is observed for the composition with x = 0.64. Copyright © Taylor & Francis Group, LLC.