Morphotropic phase boundary in (1-x)Bi(Sc_0.5In_0.5)O₃-xPbTiO₃ high temperature piezoelectric system

Abstract

Morphotropic phase boundary in (1-x)Bi(Sc_0.5In_0.5)O₃-xPbTiO₃ (x = 0.45-0.50) piezoelectric ceramics was investigated in this study. The X-ray diffraction (XRD) analysis showed that a morphotropic phase boundary (MPB) with the coexistence of the rhombohedral tetragonal was in the vicinity of x = 0.47. In addition, the ferro-piezoelectric properties of this system were also investigated. Through electrical measurement, the composition at x = 0.47 close to MPB exhibited excellent piezoelectric properties with T_c = 394°C, d₃₃ = 324 pC/N, K_p = 0.51, and P_r = 23.6 μC/cm² and E_c = 2.08 kV/mm, indicative of a future device application.