Computation of Effective Debye Temperature of Liquid Metal Alloys

Abstract

On the basics of quasicrystaline structure of liquid state Debye temperature, θD of two liquid metal alloys K-Rb and Na-Cs has been calculated at different temperatures ranging from (298.15-523.15) K and varying composition of alloys. Ultrasonic speed (u), density (ρ) and heat capacities ratio (γ) are the only data needed. Theoretical values have been compared with the standard finding and quite good agreement has been achieved. Experimental data of ρ, u and γ were taken from the literature. The negative values of ∆θD obtained are attributed to the decrease of short range order in the mixture compared to the order prevailing in pure liquid indicating less compression in mixture as compare to individual component. The mole ratios also affect the Debye temperature by decreasing its value with increase in the composition of the first component of the above two liquid metal alloys.