Giant Piezoelectricity of Ternary Perovskite Ceramics at High Temperatures

Here, novel ferroelectric ceramics of (0.95 - x)BiScO3-xPbTiO(3)-0.05Pb(Sn1/3Nb2/3)O-3 (BS-xPT-PSN) of complex perovskite structure are reported with compositions near the morphotropic phase boundary (MPB), and which exhibit a piezoelectric coefficient d(33) = 555 pC N-1, a large-signal coefficient d(33)' approximate to 1200 pm V-1 at room temperature, and a high Curie temperature T-C of 408 degrees C. More interestingly, this ternary system exhibits a giant and stable piezoelectric response at 200 degrees C with a large-signal d(33)' approximate to 2500 pm V-1, matching that of the costly relaxor-based piezoelectric single crystals at room temperature. The mechanisms of such giant piezoelectricity and its characteristic temperature dependence are attributed to the spontaneous polarization rotation and extension under an electric field and the MPB-related phase transition. The findings reveal that the BS-xPT-PSN ceramics constitute a new family of high-performance piezoelectric materials suitable for electromechanical transducers that can be operated at high temperatures (at 200 degrees C, or higher).