Ultrasonic Attenuation in Copper, Silver, and Gold

Second- and third-order elastic-constant data have been used to determine the Grüneisen mode $\gamma$ $〈\gamma 〉$, average-square Grüneisen constant $〈{\gamma }^2〉$, and nonlinear constant $D$ for Cu, Ag, and Au. The attenuation suffered by longitudinal ultrasonic waves propagating in the $〈100〉$ and $〈110〉$ directions and transverse waves polarized along $〈100〉$ and $〈1\overline{1}0〉$, owing to the phonon viscosity and thermoelastic phenomena, have been evaluated for the three metals at 293 °K. The phonon viscosity and dislocation drag along the $〈100〉$ and $〈1\overline{1}0〉$ directions are also discussed.