Propagation of Ultrasonics in Triethylamine-water Mixture

Velocity and attenuation of ultrasonic waves in a binary mixture of Triethylamine-water were measured at different temperatures by using a pulse method at 1.5 and 2.5 Mc/s. Assuming a Gaussian distribution of relaxation times centering on the main relaxation frequency, calculation showed that this main frequency lies in a range of approximately 1 to 6 Mc/s and diminishes with increasing liquid temperature below the critical solution point. Tne prominent change of sound attenuation near the critical solution temperature depends mainly on the main relaxation frequency which varies with the liquid temperature.