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Thermodynamics of Liquid Mixtures of Argon and Krypton

Abstract

ON account of their extreme molecular simplicity, binary liquid rare gas mixtures are of particular importance for testing theories which seek to calculate the thermodynamic properties of solutions. Quantum effects and the physical properties of the rare gases limit the number of such mixtures which it is possible to study over the whole range of liquid composition to two, namely argon–krypton and krypton–xenon. Even for these two mixtures, at the lowest temperature at which the whole range of composition can be covered, namely the triple-point of the less-volatile component, the vapour pressure of the other component is comparatively high. Thus, the vapour pressure of argon at the krypton triple-point is about 9.4 atm. Partly for this reason, there has not hitherto been a comprehensive investigation of the thermodynamic properties of liquid mixtures of argon and krypton or of krypton and xenon. Vapour pressure measurements have been made of solid solutions in both systems1–3, but investigations of liquid mixtures have hitherto been confined to vapour pressure and liquid and vapour composition measurements for the argon–krypton system at 88.05° K (ref. 4), when the separation of a solid phase limits the mole fraction of krypton in the liquid to a maximum of about 0.35. Similar measurements have also been made at 87.5° K (ref. 5) up to a krypton mole fraction of 0.13.

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DUNCAN, A., DAVIES, R., BYRNE, M. et al. Thermodynamics of Liquid Mixtures of Argon and Krypton. Nature 209, 1236–1237 (1966). https://doi.org/10.1038/2091236b0

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