ELASTIC, PIEZOELECTRIC, AND DIELECTRIC PROPERTIES OF LITHIUM TANTALATE

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Abstract
Room‐temperature values for all six independent elastic coefficients (at constant electric field) and all four independent piezoelectric stress coefficients have been determined from ultrasonic velocitymeasurements on a single‐crystal specimen of lithiumtantalate grown by the Czochralski technique. The two independent dielectric constants at constant strain were derived from low‐frequency measurements on thin plates of lithiumtantalate, in conjunction with the relevant elastic and piezoelectric data. The numerical results have been used to map the deviation of the elastic energy flux vector from the wave propagation direction for plane elasticwave propagation in the YZ crystallographic plane.