Dielectric and piezoelectric characteristics of lead-free Bi0.5(Na0.84K0.16)0.5TiO3 ceramics substituted with Sr

In this study, lead-free Bi-0.5(Na0.84K0.16)(0.5)TiO3 ceramics were fabricated with the variations of Sr substitution and their dielectric and piezoelectric characteristics were investigated. Through the analysis of XRD diffraction pattern and SEM, crystal structure and microstructure were evaluated. With the increasing amount of Sr substitution, dielectric constant linearly increased at the rate of about 90 per 1 mol% and Curie temperature decreased slightly. Also, the temperature dependence curve of dielectric constant moved leftward. At 4 mol% Sr substitution, T-c of 292 degreesC, k(p) of 34.3%, k(t) of 45.32%, epsilon(r) of 868 and d(33) of 185 pC/N were obtained, respectively. (C) 2004 Elsevier B.V. All rights reserved.