A rare gas mixture: from rigid to gas-like fluid by a mutual concentration change

YD Fomin and EN Tsiok and VN Ryzhov and VV Brazhkin, PHYSICA SCRIPTA, 100, 075914 (2025).

DOI: 10.1088/1402-4896/adddf2

For a number of mixtures of rare gases at high pressures, sound speed minima are experimentally observed depending on the concentration. This behavior has not yet been explained. We have studied the behavior of a mixture of argon and helium using computer simulation. Sound speed minima have been observed at a certain molar fraction of the components, which is in good agreement with experimental data. It is shown that this behavior is due to the fact that the P and T parameters for gas mixtures are near the Frenkel line, separating the states of rigid and quasi-gas fluid.

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