Modified Pb(Mg_1/3Nb_2/3)O₃-PbZrO₃–PbTiO₃ ceramics with high piezoelectricity and temperature stability

There is a great demand to develop ferroelectric ceramics with both high piezoelectric coefficient and broad temperature usage range for emerging electromechanical applications. Herein, a series of Sm -doped 0.25Pb(Mg Nb )O -(0.75−x)PbZrO -xPbTiO ceramics were fabricated by solid-state reaction method. The phase structure, dielectric and piezoelectric properties were investigated, where the optimum piezoelectric coefficient d = 745 pC/N and electromechanical coupling factor k = 0.79 were obtained at the morphotropic phase boundary composition x = 0.39, with good Curie temperature T of 242°C. Of particular importance is that high-temperature stability of the piezoelectric and field-induced strain was obtained over the temperature range up to 230°C for the tetragonal compositions of x = 0.40. The underlying mechanism responsible for the high piezoelectricity and temperature stability is the synergistic contribution of the MPB and local structural heterogeneity, providing a good paradigm for the design of high-performance piezoelectric materials to meet the challenge of piezoelectric applications at elevated temperature. 3+ 1/3 2/3 3 3 3 33 33 C