Elastic and piezoelectric properties of lead potassium niobate

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Abstract
All the elastic and piezoelectric constants of ferroelectric lead potassium niobate were measured by the use of the thickness vibrations of plates. Calculating the electromechanical coupling factors of rotated cuts, it was shown that the y‐cut plate has the largest coupling factor of 0.73 for the shear mode and the z‐cut plate has the largest coupling factor of 0.59 for the extensional mode. If the piezoelectricity arises from the effect of each oxygen octahedron, the metal ions seem to displace parallel to one of the 4mm axes of the oxygen octahedron within the tetragonal c plane.