Manganese-modified BiScO3-PbTiO3 piezoelectric ceramic for high-temperature shear mode sensor -: art. no. 262904

The bismuth-based perovskite solid solution (100-x)BiScO3-xPbTiO(3) (BSPT) was investigated for use at temperatures up to 400 degrees C and above. The high-temperature resistivity, together with dielectric and piezoelectric behaviors of the shear mode for manganese-modified BSPT ceramics near the morphotropic phase boundary composition were studied. The resistivity and time constant were found to be 3x10(7) Omega cm and 0.08 s, respectively, at 450 degrees C for modified BSPT66. The dielectric constant Kappa(T)(11) and dielectric loss were found to be 1112 and 1%, respectively, at room temperature, showing a Curie temperature at 468 degrees C. The electromechanical coupling factor k(15) was calculated to be 61%, staying nearly constant up to 440 degrees C, expanding the temperature usage range significantly. The properties indicate that the modified BSPT66 material is a promising candidate for high-temperature shear sensor applications.