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 velocity measurements on a single-crystal specimen of lithium tantalate grown by the Czochralski technique. The two independent dielectric constants at constant strain were derived from low-frequency measurements on thin plates of lithium tantalate, 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 elastic wave propagation in the YZ crystallographic plane.
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