The dielectric and piezoelectric properties of the new perovskite solid solution system (1 - x)BiScO3-xPbTiO3 were investigated. This system is representatively of a new group of high temperature piezoelectrics that includes Bi(Me)O3-PbTiO3 where Me+3 is a relatively large cation, Sc, Y, Yb, In, etc., and combinations thereof. In the (1 - x)BiScO3-xPbTiO3 series, perovskite stability was achieved for x > 50 mol% PbTiO3 being ferroelectric rhombohedral and transforming to ferroelectric tetragonal in the region x = 64 mol% PbTiO3, designated as the morphotropic phase boundary (MPB). Analogous to (1 - x)PbZrO3-xPbTiO3 (PZT), the dielectric and piezoelectric properties were enhanced for compositions near the MPB. Piezoelectric coefficient d33 values reached 450 pC/N, comparable to soft PZT's with a transition temperature of 450°C, more than 100°C higher than commercial PZT. The combination of high TC and excellent piezoelectric activity make (1 - x)BiScO3-xPbTiO3 materials candidates for high temperature, and temperature stable actuators and transducers.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)