The Influence of the Dopants on the Properties of Lead Zirconate Titanate System

The doped Pb(Zr_0.52Ti_0.48)O₃ system with Nb⁵⁺ and Sr²⁺ were obtained by solid state reactions. The influence of nature of dopants on structural and microstructural properties were analyzed by XRD and SEM techniques and were also investigated the obtained dielectric and piezoelectric properties. The XRD analyzes and the SEM images highlighted the obtaining of homogeneous tetragonal structures, of the perovskite type. The physical (ρ_a), dielectric constant (ɛ_r) and piezoelectric (k_p) properties of the doped PZT systems were investigated. The Nb⁵⁺ doped Pb(Zr_0.52Ti_0.48)O₃ system presented the ɛ_r = 488 and k_p = 0,52. Sr²⁺ substitution for Nb⁵⁺ doped Pb(Zr_0.52Ti_0.48)O₃ reduced the Curie temperature (from 420°C to 360°C), increased the dielectric constant at 1180, and also decreasing the k_p (0,39).