Determination of the Elastic and Piezoelectric Coefficients of Monoclinic Crystals, with particular Reference to Ethylene Diamine Tartrate

Abstract

The dynamic determination of elastic and piezoelectric coefficients of crystals belonging to the monoclinic sphenoidal class is discussed using the longitudinal mode of vibration for narrow bars, low-frequency longitudinal and face-shear modes for square plates containing the axis of symmetry, coupled modes for square plates perpendicular to the axis of symmetry and the thickness-shear mode for plates containing the axis of symmetry. A new set of values for the elastic and piezoelectric coefficients and their temperature coefficients for ethylene diamine tartrate is given based on this method. Some properties are considered of face-shear vibrating square plates of ethylene diamine tartrate rotated about the axis of symmetry as functions of the orientation, and of Y-cut plates as functions of the breadth-length ratio