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Ultrasonic Characterization of Bi2(Te_1-x Se_x)_3 System

Gaafar M. El-Sayed, Soliman L. I., Marzouk S. Y.

Archives of Acoustics

2009

Vol. 34, No. 4

715-725

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.

Ultrasonic study of CuxAg1-xInTe2 bulk material

Gaafar M. El-Sayed, El-Sayad E. A.

Archives of Acoustics

2008

Vol. 33, No. 3

363-372

Longitudinal and shear ultrasonic wave velocities were measured in the quaternary compounds CuxAg1¡xInTe2 (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. Results indicated that these parameters are influenced by the increased addition of copper from x = 0 to 1.