Abstract
The phase separation in the liquid binary system of neon and normal deuterium has been investigated by measuring the specific heat at saturation for different compositions between 24 K and 27.5 K. The phase-separation curve has been determined. The coordinates of the upper critical consolute point are T c = 25.71 K and χ D 2 = 0.354. The temperature at which the two-liquid region is terminated by the solidification of the neon is T M = 23.86 K. The excess enthalpy, the excess entropy and the excess Gibbs function of the liquid mixture have been calculated as a function of temperature and composition. For the systems Ne-nH 2 and Ne-nD 2 the critical coefficient β has been determined from the shape of the phase-separation curve. Finally a comparison of the experimental results with the results of Prigogine's theory for isotopic mixtures of quantum fluids has been made. Only qualitative agreement has been found.
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