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 B_s (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 B_s 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 (B_T) of 5.614×10¹¹ dyn∕cm² and (∂B_T∕∂P) of 4.78.