A shear-bending mode high temperature piezoelectric actuator

A single ring-shape ceramic plate piezoelectric actuator operated in shear-bending mode was proposed for high-temperature operation. The actuator was formed from BiScO3-PbTiO3 ceramic and polarized in the radial direction. A large bending displacement at the center of the actuator was piezoelectrically generated under an applied voltage in the thickness direction due to axial-symmetric shear strain of the ring-shape configuration. The displacement obtained at 200 degrees C was about 20 mu m, 11-14 times that of a normal piezoelectric plate of identical size. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4730326]