Abstract
The Surface acoustic wave (SAW) velocities and the associated mechanical and electric fields for the Z-axis cylinder family of cuts in potassium niobate (KNbO/sub 3/) have been theoretically calculated. It is found that these cuts support pure shear horizontal (SH) SAWs or Bleustein-Gulyaev (BG) waves with displacements in the surface plane and perpendicular to the propagation direction and an electric field in the sagittal plane. The piezoelectric coupling coefficient is predicted to have a maximum of 53%, which is significantly larger than any SAW coupling coefficient observed in LiNbO/sub 3/, LiTaO/sub 3/ or quartz. Since the SH SAW is not damped when loaded with a liquid, the Z-axis cylinder cuts of KNbO/sub 3/ may offer promising piezoelectric substrates for liquid phase acoustic wave sensors.
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