Modified Pb(Mg <sub>1/3</sub> Nb <sub>2/3</sub> )O <sub>3</sub> ‐PbZrO <sub>3</sub> –PbTiO <sub>3</sub> ceramics with high piezoelectricity and temperature stability
Pengbin Wang, Qinghu Guo, Fei Li, Fangquan Xia, Hua Hao, Huajun Sun, Hanxing Liu, Shujun Zhang
Abstract
Abstract 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 3+ ‐doped 0.25Pb(Mg 1/3 Nb 2/3 )O 3 ‐(0.75− x )PbZrO 3 ‐ x PbTiO 3 ceramics were fabricated by solid‐state reaction method. The phase structure, dielectric and piezoelectric properties were investigated, where the optimum piezoelectric coefficient d 33 = 745 pC/N and electromechanical coupling factor k 33 = 0.79 were obtained at the morphotropic phase boundary composition x = 0.39, with good Curie temperature T C 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.