Temperature dependence of dielectric, piezoelectric and elastic properties of BiScO3-PbTiO3 high temperature ceramics with morphotropic phase boundary (MPB) composition
(1-x)BiScO3–xPbTiO3 (BS–PT) high temperature piezoelectric ceramics were prepared by traditional solid-state reaction method. Combining X-ray diffraction (XRD) results with piezoelectric results, it was found that the morphotropic phase boundary (MPB) is near x = 0.633. The whole set of material constants, such as elastic (sij, cij), piezoelectric (dij, eij, gij, hij), dielectric (Îµij, Î²ij), and electromechanical coupling coefficients (kij) for MPB composition were obtained by the resonance method from room temperature to 450 oC. The values of d33, −d31, d15, g33, and Qm for MPB composition at room temperature were 441 pC/N, 117 pC/N, 620 pC/N, 47.3 × 10−3 Vm/N, and 28, respectively. Temperature-dependent free dielectric , elastic , and electromechanical coupling coefficients kij for MPB composition were extremely stable from room temperature up to 350 oC. The systematical characterization of dielectric, piezoelectric, and elastic coefficients in the wide temperature range (from room temperature to 450 oC) may promote the design and application of high temperature piezoelectric sensors and actuators based on BS–PT ceramics. âº The full set of material constants of BiScO3–PbTiO3 (BS–PT) ceramics was obtained. âº BS–PT ceramics show typical characteristics of “soft” piezoelectric ceramics. âº Values of d33 and d15 of BS–PT ceramics were 441 and 620 pC/N, respectively. âº Dielectric and elastic properties of BS–PT ceramics are stable from 25 to 350 °C.