Longitudinal and shear ultrasonic wave velocities were measured in the ternary compounds Bi2(Te_1-x Se_x)_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.
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