Ultrasonic Attenuation in Copper, Silver, and Gold

Second- and third-order elastic-constant data have been used to determine the Gr\"uneisen mode γ 〈γ〉, average-square Gr\"uneisen constant 〈γ²〉, 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 〈11̄0〉, 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 〈11̄0〉 directions are also discussed.