Excess thermodynamic functions of liquid He3–He4 solutions

Different experimental data are studied analytically in order to obtain the main excess thermodynamic functions of liquid He3–He4 solutions. Data in the literature for solutions under the saturated vapor pressure and data obtained for solutions under high pressures, up to solidification, are used. The dependence of the excess thermodynamic functions (GE, SE, HE) on the pressure, temperature, and concentration of the mixture are analyzed in detail. These data are compared to the results of calculations based on different theoretical models. Conclusions are drawn concerning the relative role of different quantum mechanisms leading to nonideality of He3–He4 liquid isotopic mixtures.

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