Elastic Moduli of Gallium Antimonide under Pressure and the Evaluation of Compression to 80 kbar

Abstract
Ultrasonic wave velocities in GaSb have been measured at 25°C as a function of hydrostatic pressure to 2 kbar. The adiabatic ``zero‐field'' stiffness moduli calculated from these velocities (for 1 atm) are as follows: c11 = 8.839±0.008, c12 = 4.033±0.010, c44 = 4.316±0.004, and Bs (bulk modulus) = 5.635±.012. All moduli are in units of 1011 dyn/cm2 and are based on a density of 5.6137 g/cm3 taken as exact with respect to estimates of errors. Hydrostatic pressure derivatives for c11, c12, c44, and Bs are, respectively, 4.96±0.10, 4.64±0.15, 1.01±0.02, and 4.75±0.15. The static compression of GaSb to 80 kbar has been evaluated using the isothermal bulk modulus (BT) of 5.614×1011 dyn/cm2 and (∂BT/∂P) of 4.78.