Abstract
Longitudinal and shear ultrasonic wave velocities were measured in the ternary compounds Bi-2(Te1-xSex)(3) (0 <= x <= 1), using pulse echo technique. Measurements were carried out at 4 MHz frequency and at room temperature. Elastic moduli and acoustic impedance have been calculated. The results indicate that these parameters are influenced by the increased addition of selenium from x = 0 to 1.