No abstract

Surface acoustic wave properties of fresnoite have been calculated from bulk material parameters and have been measured along several orientations on samples cut from Czochralski-grown crystals. Favorable properties are measured for the z-cut x-propagating wave: the coupling coefficient k2 is 0.016±0.003, the velocity is 2678 m/sec, and the temperature coefficient of delay is 51×10−6/ °C. These values, as well as those measured for the much lower coupling x-z and x-y surface waves, are in agreement with calculations. The calculations also predict that, for surface waves propagating in the x direction on a surface whose normal is at 45° to z and y axes, the coupling coefficient is 10% higher than calculated for the above z-x case.