The compressibility of liquid sodium alloys

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Abstract
The velocity of sound at 7·5 Mhz and the density have been measured as functions of temperature for a number of liquid alloys based on Na. The results cover the whole concentration range for the Na-Hg system and the range from 0 to about 5 atomic % of the solute for Na + Au. Cd, In, Pb and Sn. From the results the adiabatic compressibility and the mean molar volume have been deduced. The behaviour of these quantities provides no convincing evidence for compound formation in the liquid phase of Na-Hg. There is, however, a substantial volume contraction on mixing and, apparently because of this contraction, the compressibility when plotted against composition falls well below the straight line linking the values in pure Na and pure Hg. The results for the dilute Na alloys suggests that this contraction and the associated reduction of the adiabatic compressibility are not peculiar to Na-Hg. The effects of all the different solutes used are, indeed, remarkably similar.

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