Excellent piezoelectric constant and thermal stability in BiScO3-PbTiO3 piezoelectric ceramics via domain engineering

The application of piezoelectric ceramics at high temperature is limited because they can't have both high piezoelectric coefficient and high Curie temperature. While, BiScO(3)ePbTiO(3)-based piezoelectric ceramics possessing high Curie temperature and piezoelectric properties simultaneously have drawn increasing attention due to their potential applications at high temperature. Here, we reported a novel compositional design of (1-x)[0.36BiScO(3)-0.64PbTiO(3)]-xBi(Sn1/3Nb2/3)O-3 (abbreviated as BS-PT-xBSN). BS-PT-xBSN ceramic samples were synthesized by conventional solid state reaction method. According to the ternary phase diagram of BS-PT-xBSN ceramics brought up in this work, the morphotropic phase boundaries (MPB) were confirmed, which is located in the vicinity of x = 0.02. It canbe identified that the x = 0.02 sample near MPB has the optimal electric performance which are giant piezoelectric coefficient (d(33) similar to 450 pC/N, higher 18 % than undoped samples) and high Curie temperature (T-c similar to 368 degrees C) as well as large remant polarization (P-r similar to 46.6 mu C/cm(2)). In addition, the variation of P-r is 3 % in the temperature range of 30-180 degrees C and the depolarization temperature of x = 0.02 ceramics is about 280 degrees C. Structural analysis such as in-situ PFM and TEM confirms that giant piezoelectricity and depolarization temperature are attributed to the appearance of nano-domain and complexity of domains as well as the stable domain configuration. This work not only reveal the high potential of BS-PT-xBSN for high-temperature piezoelectric applications but also open up a feasible approach to design new high-temperature piezoelectric ceramics. (C) 2021 The Chinese Ceramic Society. Production and hosting by Elsevier B.V.