Phase diagram of CO–Ar. The detection of a critical point

The phase diagram of the equilibrium CO–Ar system has been studied by an x-ray diffraction method. It was established that a monotectoid transformation exists in this system, in addition to the eutectoid transformation found earlyer by Barrett and Meyer. It is shown that a region above the monotectoid transformation temperature (T = 56.2° K) contains two phases with the same hexagonal symmetry, differing appreciably in the lattice volumes and, evidently, in the short-range orientational order. This region is limited from above by the existence curve with a critical concentration point at T = 59.5±0.5° K. It follows from the experiments carried out that supercritical homogeneous hcp solutions can supercool under certain conditions down to helium temperatures.

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